{"title":"Hamilton","description":"","products":[{"product_id":"hamilton-factory-mainspring-for-12s-hamilton-17-jewel-no-1228-or-3028-steel","title":"Hamilton Factory Mainspring for 12s Hamilton 17 Jewel No. 1228 or 3028 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory Mainspring for 12s 17 Jewel Movements, No. 1228 or 3028, steel, new in often frail or even sliced envelope. These were available in several different strengths and those that I can supply are shown in the dropdown list.  See images for precise characteristics. I likely have several of these in each strength so the one you get may differ slightly from the images.  I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a marginally adequate job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":".17","offer_id":47451750990132,"sku":"PMA-HAM1228S-17","price":5.0,"currency_code":"USD","in_stock":true},{"title":".175","offer_id":47451751022900,"sku":"PMA-HAM1228S-15","price":4.0,"currency_code":"USD","in_stock":true},{"title":".18","offer_id":47451751055668,"sku":"PMA-HAM1228S-18","price":6.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/992207107.jpg?v=1705270087"},{"product_id":"hamilton-factory-dynavar-mainspring-for-20-0-21-0s-hamilton-no-36432-alloy","title":"Hamilton Factory Dynavar Mainspring for 20\/0 \u0026 21\/0s Hamilton No. 36432 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory \u003cem\u003eDynavar\u003c\/em\u003e Mainspring for 20\/0s \u0026amp; 21\/0s Movements, Catalog No. 36432, alloy, new in envelope. Made for Grades 995, 995A, 997 \u0026amp; 721, and perhaps others.  See image for precise characteristics.  I likely have several of these so the one you get may differ slightly from the images.  I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. \u003c\/span\u003eImages do a pretty good job of representing the item.  \u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451754266932,"sku":"PMA-HAM36432A-03","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/990448201.jpg?v=1705270179"},{"product_id":"hamilton-factory-dynavar-mainspring-for-8-0s-hamilton-no-717271-alloy","title":"Hamilton Factory Dynavar Mainspring for 8\/0s Hamilton No. 717271 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory \u003cem\u003eDynavar\u003c\/em\u003e Mainspring for 8\/0s Movements, Catalog No. 717271, alloy, new in frail envelope. See image for precise characteristics. I like have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451755741492,"sku":"PMA-HA717271A-09","price":12.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/915129952.jpg?v=1705270255"},{"product_id":"hamilton-factory-mainspring-for-6-0s-hamilton-no-2321-steel","title":"Hamilton Factory Mainspring for 6\/0s Hamilton No. 2321 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e\u003cstrong\u003e \u003c\/strong\u003eFactory\u003cstrong\u003e \u003c\/strong\u003e\u003cem\u003e\u003c\/em\u003e Mainspring for 6\/0s Hamilton Movements such the 986, 987 and variants, Factory No. 2321, steel, T end, new in frail envelope.  See images for further information characteristics. I likely have several of these so the one you get might differ slightly from the images.  I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451758133556,"sku":"PMA-HAM2321S-08","price":6.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/522217765.jpg?v=1705270432"},{"product_id":"hamilton-factory-dynavar-mainspring-for-20-0-21-0s-hamilton-no-36433-alloy","title":"Hamilton Factory Dynavar Mainspring for 20\/0 \u0026 21\/0s Hamilton No. 36433 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory \u003cem\u003eDynavar\u003c\/em\u003e Mainspring for 20\/0s \u0026amp; 21\/0s Movements, Catalog No. 36433, alloy, new in envelope. Made for Grades 995, 995A, 997 \u0026amp; 721, and perhaps others.  See image for precise characteristics. I likely have several of these so the one you get may differ slightly from the images.  I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. \u003c\/span\u003eImages do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451758559540,"sku":"PMA-HAM36433A-01","price":3.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/990783330.jpg?v=1705270481"},{"product_id":"hamilton-factory-dynavar-mainspring-for-22-0s-hamilton-no-32433-alloy","title":"Hamilton Factory Dynavar Mainspring for 22\/0s Hamilton No. 32433 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory \u003cem\u003eDynavar\u003c\/em\u003e Mainspring for 22\/0s Movements, Grades 911 \u0026amp; 911M, Catalog No. 32433, alloy, new in envelope. Made for Grades 911 \u0026amp; 911M, and perhaps others.  See image for precise characteristics. I likely have several of these so the one you get may differ slightly from the images.  I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. \u003c\/span\u003eImages do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451758592308,"sku":"PMA-HAM32433A-01","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/987662142.jpg?v=1705270486"},{"product_id":"hamilton-dynavar-mainspring-for-22-0s-grade-911-911m-no-32432-alloy","title":"Hamilton Dynavar Mainspring for 22\/0s grade 911 \u0026 911M No. 32432 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory \u003cem\u003eDynavar\u003c\/em\u003e Mainspring for 22\/0s Movements, Factory No. 32432, alloy, new in envelope. Made for Grades 911 \u0026amp; 911M, and perhaps others. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451758723380,"sku":"PMA-HAM32432A-03","price":5.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/987662146.jpg?v=1705270492"},{"product_id":"hamilton-18s-factory-mainspring-no-232-steel","title":"Hamilton 18s Factory Mainspring No. 232 - Steel","description":"\u003cp\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory\u003cstrong\u003e \u003c\/strong\u003eMainspring for 18s Motor Barrel Movements, Factory No. 232, steel, new in possibly likely very frail envelope. See images for precise mainspring specifications. These are usually pretty sticky or have dried on protecting oil so they need to be cleaned carefully before use. I likely have several of these so the one you get may differ slightly from the images but it will have the same specifications. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451758788916,"sku":"PMA-HAM0232S-09","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/1151523894.jpg?v=1705270504"},{"product_id":"hamilton-14-0s-factory-mainspring-718441-steel","title":"Hamilton 14\/0s Factory Mainspring No. 718441 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring for 14\/0s 17 - 19 Jewel Movements, Factory No. 718441, steel, new in envelope. See images for further details. I likely have several of these so the one you get may differ slightly from the images. I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. \u003c\/span\u003eImages do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451759051060,"sku":"PMA-HA718441S-11","price":6.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/987586071.jpg?v=1705270535"},{"product_id":"hamilton-dynavar-14-0s-factory-mainspring-14432-alloy","title":"Hamilton Dynavar 14\/0s Factory Mainspring No. 14432 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003cem\u003e\u003c\/em\u003e\u003c\/strong\u003e\u003cem\u003eDynavar \u003c\/em\u003eFactory Mainspring for 14\/0s 17 - 19 Jewel Movements, Factory No. 14432, alloy, new in envelope. See image for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451759116596,"sku":"PMA-HA714432A-09","price":15.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-10-10_15.00.58.jpg?v=1760133689"},{"product_id":"hamilton-factory-dynavar-mainspring-for-22-0s-hamilton-no-717601-alloy","title":"Hamilton Factory Dynavar Mainspring for 22\/0s Hamilton No. 717601- Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory \u003cem\u003eDynavar\u003c\/em\u003e Mainspring for 22\/0s Movements, Factory No. 717601, alloy, new in envelope. Made for Grades 911 \u0026amp; 911M, and perhaps others. I likely have several of these so the one you get may differ slightly from the images but it will be the same factory Hamilton mainspring. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item. \u003cbr\u003e\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451760820532,"sku":"PMA-HAM717601A-11","price":5.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/477733050.jpg?v=1705270763"},{"product_id":"hamilton-16s-motor-barrel-factory-mainspring-534-steel","title":"Hamilton 16s Motor Barrel Factory Mainspring No. 534 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring for 16s Motor Barrel Movements, Factory No. 534, steel, new in a possibly very frail and\/or damaged envelope. These where available in several different strengths and the ones I can supply are shown in the drop-down list. I likely have several of these so the mainspring you receive may differ very slightly from the images. See images for precise characteristics. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":".15","offer_id":47451765080372,"sku":"PMA-HAM0534S-15","price":10.0,"currency_code":"USD","in_stock":false},{"title":".155","offer_id":47451765113140,"sku":"PMA-HAM0534S-55","price":11.0,"currency_code":"USD","in_stock":false},{"title":".16","offer_id":47451765145908,"sku":"PMA-HAM0534S-16","price":10.0,"currency_code":"USD","in_stock":false},{"title":".165","offer_id":47451765178676,"sku":"PMA-HAM0534S-65","price":10.0,"currency_code":"USD","in_stock":true},{"title":".17","offer_id":47451765211444,"sku":"PMA-HAM0534S-17","price":10.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/2963216689.jpg?v=1705270900"},{"product_id":"hamilton-dynavar-8-0s-factory-mainspring-factory-no-44433-alloy","title":"Hamilton Dynavar 8\/0s Factory Mainspring Factory No. 44433 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003cem\u003e\u003c\/em\u003e\u003c\/strong\u003e\u003cem\u003eDynavar \u003c\/em\u003eFactory Mainspring for 8\/0s Movements (747 \u0026amp; 748), Factory No. 44433, alloy, new in frail envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451770585396,"sku":"PMA-HAM44433A-03","price":12.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/3129595896.jpg?v=1705271193"},{"product_id":"hamilton-factory-dynavar-mainspring-for-21-0s-hamilton-grades-750-751-no-46433-alloy","title":"Hamilton Factory Dynavar Mainspring for 21\/0s Hamilton Grades 750 \u0026 751 No. 46433 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory \u003cem\u003eDynavar\u003c\/em\u003e Mainspring for 21\/0s Movements, Grades 750 \u0026amp; 751, Catalog No. 46433 \/ 717572, alloy, new in envelope. See image for precise characteristics. I likely have several of these so the one you get may differ slightly from the images.  I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. \u003c\/span\u003eImages do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451770650932,"sku":"PMA-HAM46433A-05","price":4.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/494520043.jpg?v=1705271198"},{"product_id":"hamilton-factory-mainspring-no-6221-for-22-0s-steel","title":"Hamilton Factory Mainspring No. 6221 for 22\/0s - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring No. 6221 for 22\/0s caliber 911 movements and perhaps others, steel, new in envelope. See images for precise characteristics. I likely have several of these so the one you get may differ slightly from the images but they are all same Hamilton factory mainspring. I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. \u003c\/span\u003eImages do a pretty good job of representing the item. \u003cbr\u003e\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451792867636,"sku":"PMA-HAM6221S-08","price":3.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/513884291.jpg?v=1705272030"},{"product_id":"hamilton-factory-mainspring-no-2621-for-6-0s-steel","title":"Hamilton Factory Mainspring No. 2621 for 6\/0s - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring No. 2621 for 6\/0s 19j movements and perhaps others, steel, new in (yet possibly quite frail) envelope. These were available in a couple of different strengths and those that I can supply are shown in the drop-down list.  I likely have several of these so the packaging may differently slightly from the images.   See image for precise characteristics.   I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. \u003c\/span\u003eImages do a pretty good job of representing the item.\u003cbr\u003e\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":".115","offer_id":47451797946676,"sku":"PMA-HAM2621S-15","price":6.5,"currency_code":"USD","in_stock":true},{"title":".11","offer_id":47451797979444,"sku":"PMA-HAM2621S-11","price":7.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/3244272822.jpg?v=1705272109"},{"product_id":"hamilton-factory-dynavar-mainspring-for-21-0s-hamilton-no-717571-alloy","title":"Hamilton Factory Dynavar Mainspring for 21\/0s Hamilton No. 717571 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory \u003cem\u003eDynavar\u003c\/em\u003e Mainspring for 21\/0s Movements, Grades 750 \u0026amp; 751, Catalog No. 717571, alloy, new in envelope. Made for Grades 750 \u0026amp; 751, and perhaps others in the upper 700 grade range.  See image for precise characteristics. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are \nunconditionally guaranteed.  Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451799748916,"sku":"PMA-HAM717571A-01","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/521644933.jpg?v=1705272179"},{"product_id":"hamilton-factory-dynavar-mainspring-for-20-0-21-0s-hamilton-no-717531-alloy","title":"Hamilton Factory Dynavar Mainspring for 20\/0 \u0026 21\/0s Hamilton No. 717531 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory \u003cem\u003eDynavar\u003c\/em\u003e Mainspring for 20\/0s \u0026amp; 21\/0s Movements, Catalog No. 717531, alloy, new in envelope. Made for Grades 995, 995A, 997 \u0026amp; 721, and perhaps others.  See image for precise characteristics. I likely have several of these so the one you get may differ slightly from the images.  I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. \u003c\/span\u003eImages do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451804631348,"sku":"PMA-HAM717531A-06","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/522164986.jpg?v=1705272246"},{"product_id":"hamilton-factory-mainspring-for-18-0s-hamilton-no-2721-steel","title":"Hamilton Factory Mainspring for 18\/0s Hamilton No. 2721 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e\u003cstrong\u003e \u003c\/strong\u003eFactory\u003cstrong\u003e \u003c\/strong\u003e\u003cem\u003e\u003c\/em\u003e Mainspring for 18\/0s Hamilton 17j Movements, Factory No. 2721, steel, new in envelope. See image for precise mainspring specifications.  These were available in several different strengths and those that I can supply are shown in the drop-down list. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":".0075","offer_id":48428989481268,"sku":"PMA-HAM2721S-07","price":5.0,"currency_code":"USD","in_stock":true},{"title":".008","offer_id":48428987384116,"sku":"PMA-HAM2721S-08","price":4.0,"currency_code":"USD","in_stock":true},{"title":".0085","offer_id":48428987416884,"sku":"PMA-HAM2721S-10","price":4.0,"currency_code":"USD","in_stock":true},{"title":".009","offer_id":48428987449652,"sku":"PMA-HAM2721S-09","price":5.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/522651754.jpg?v=1705272271"},{"product_id":"hamilton-factory-16s-mainspring-factory-no-317-steel","title":"Hamilton Factory 16s Mainspring Factory No. 317 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring for 16s 17-21 Jewel Movements, Factory No. 317, steel, new in envelope. See images for precise mainspring specifications. The beautiful think about factory mainsprings is that they always fit! I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451836481844,"sku":"PMA-HAM0317S-06","price":17.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/1659259892.jpg?v=1705272718"},{"product_id":"hamilton-16s-factory-mainspring-718048-for-992b-steel","title":"Hamilton 16s Factory Mainspring No. 718048 for 992B - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring for 16s 21j 992B Movements, Factory No. 718048 (534B), steel, new in frail envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451840872756,"sku":"PMA-HAM718048S-12","price":15.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/1020264098.png?v=1705272902"},{"product_id":"hamilton-factory-mainspring-for-16s-17-21j-factory-no-718041-317-steel","title":"Hamilton Factory Mainspring for 16s 17-21j Factory No. 718041 (317) - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring for 16s 17 - 21 Jewel Movements (such as the 974 \u0026amp; 992), Factory No. 718041 \/ 317, steel, new in possibly frail or torn envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. \u003c\/span\u003eImages do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451872493876,"sku":"PMA-HA718041S-04","price":17.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-01-30_15.53.44.jpg?v=1769817268"},{"product_id":"hamilton-18s-factory-mainspring-no-14-for-23j-movements-steel","title":"Hamilton 18s Factory Mainspring No. 14 for 23j Movements - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring \nfor 18s 23j Motor Barrel Movements, Factory No. 14, steel, new in possibly frail envelope. See images for precise mainspring specifications.  I likely have several of these so the one you get may differ slightly from the images.  I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of \nrepresenting the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451880161588,"sku":"PMA-HAM014S-01","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-09-05_19.10.45.jpg?v=1757124677"},{"product_id":"hamilton-factory-mainspring-for-10s-12s-hamilton-no-6021-steel","title":"Hamilton Factory Mainspring for 10s \u0026 12s Hamilton No. 6021 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory Mainspring for 10s \u0026amp; 12s Movements, No. 6021, steel, new in very frail envelope. See image for precise characteristics. These were available in a couple of different strengths and those that I can supply are shown in the drop-down list. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":".16","offer_id":47451888484660,"sku":"PMA-HAM6021S-16","price":5.0,"currency_code":"USD","in_stock":true},{"title":".17","offer_id":47451888517428,"sku":"PMA-HAM6021S-17","price":4.0,"currency_code":"USD","in_stock":true},{"title":".18","offer_id":47451888550196,"sku":"PMA-HAM6021S-18","price":5.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/756545907.jpg?v=1705273787"},{"product_id":"hamilton-factory-mainspring-no-1721-or-1921-for-6-0s-steel","title":"Hamilton Factory Mainspring No. 1721 or 1921 for 6\/0s - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring No. 1721 or 1921 for 6\/0s 17j movements and perhaps others, steel, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. \u003c\/span\u003eImages do a pretty good job of representing the item.\u003cbr\u003e\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451892842804,"sku":"PMA-HAM1921S-02","price":6.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/1479511076.jpg?v=1705273973"},{"product_id":"hamilton-factory-mainspring-for-8-0s-hamilton-no-7221-718271-steel","title":"Hamilton Factory Mainspring for 8\/0s Hamilton No. 7221 \/ 718271 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory Mainspring for 8\/0s 17j Movements, Catalog No. 7221 \/ 718271, steel, new in envelope.  See images for further details.  These were available on a couple of different strengths and those that I can supply can be found in the drop-down list.  I likely have several of these so the one you get may differ slightly from the images.  I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":".85","offer_id":47451892908340,"sku":"PMA-HAM7221S-85","price":4.5,"currency_code":"USD","in_stock":true},{"title":".95","offer_id":47451892941108,"sku":"PMA-HAM7221S-95","price":4.0,"currency_code":"USD","in_stock":true},{"title":".9","offer_id":47451892973876,"sku":"PMA-HAM7221S-90","price":3.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/771590170.jpg?v=1705273983"},{"product_id":"hamilton-factory-mainspring-for-20-0-21-0s-17j-hamilton-no-718530","title":"Hamilton Factory Mainspring for 20\/0-21\/0s 17j Hamilton No. 718530","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring \nfor 20\/0s \u0026amp; 21\/0s 17 Jewel Movements, #718530, new in envelope.  See \nimage for precise characteristics.   I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed.  \u003c\/span\u003eImages do a pretty good job of \nrepresenting the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451900510516,"sku":"PMA-HAM718530A-04","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/822756414.jpg?v=1705274428"},{"product_id":"hamilton-factory-mainspring-for-6-0s-hamilton-no-2521-steel","title":"Hamilton Factory Mainspring for 6\/0s Hamilton No. 2521 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e\u003cstrong\u003e \u003c\/strong\u003eFactory\u003cstrong\u003e \u003c\/strong\u003e\u003cem\u003e\u003c\/em\u003e Mainspring for 6\/0s Hamilton 17j Movements, Factory No. 2521, steel, new in possibly frail envelope.  See image for precise mainspring specifications.  I likely have several of these so the one you get may differ slightly from the images.  I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451907522868,"sku":"PMA-HAM2521S-08","price":6.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/1151529719.jpg?v=1705274664"},{"product_id":"hamilton-factory-mainspring-no-1535-for-0s-steel","title":"Hamilton Factory Mainspring No. 1535 for 0s - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring No. 1535 for 0s motor barrel movements and perhaps others, steel, new in likely frail envelope.   See image for precise characteristics.   I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. \u003c\/span\u003eImages do a pretty good job of representing the item.\u003cbr\u003e\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451918893364,"sku":"PMA-HAM1535S-07","price":4.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/859896818.jpg?v=1705275400"},{"product_id":"hamilton-factory-mainspring-for-12s-17j-hamilton-no-718071-1228-3028-steel","title":"Hamilton Factory Mainspring for 12s 17j Hamilton No. 718071 \/ 1228 \/ 3028 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Steel Mainspring for 12s 17 Jewel Movements, Factory No. 718071 \/ 1228 \/ 3028, steel, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. \u003c\/span\u003eImages do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451918926132,"sku":"PMA-HAM718071S-10","price":8.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/2666264270.jpg?v=1705275406"},{"product_id":"hamilton-14-0s-factory-mainspring-718440-steel","title":"Hamilton 14\/0s Factory Mainspring No. 718440 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring for 14\/0s, 17 - 19 Jewel Movements, Factory No. 718440, steel, new in frail envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. \u003c\/span\u003eImages do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451925086516,"sku":"PMA-HA718440S-05","price":8.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2024-11-16_15.36.17.jpg?v=1731800230"},{"product_id":"hamilton-factory-mainspring-for-12-0s-hamilton-no-4128-steel","title":"Hamilton Factory Mainspring for 12\/0s Hamilton No. 4128 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory Mainspring for 12\/0s Movements, No. 4128, steel, new in envelope. See image for precise characteristics. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451926167860,"sku":"PMA-HAM4128S-09","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/898248801.jpg?v=1705275801"},{"product_id":"hamilton-factory-mainspring-no-3328-for-12s-17j-steel","title":"Hamilton Factory Mainspring No. 3328 for 12s 17j - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring \nfor 12s 17 Jewel Movements, Factory No. 3328, steel, new in frail envelope.  See \nimage for precise characteristics. I likely have quite a few of these so they one you get may differ slightly from the images.   I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed.  \u003c\/span\u003eImages do a pretty good job of \nrepresenting the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451930198324,"sku":"PMA-HAM03328S-10","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/915191370.jpg?v=1705276112"},{"product_id":"hamilton-factory-dynavar-mainspring-for-8-0s-hamilton-no-717272-alloy","title":"Hamilton Factory Dynavar Mainspring for 8\/0s Hamilton No. 717272 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory \u003cem\u003eDynavar\u003c\/em\u003e Mainspring for 8\/0s Movements, Catalog No. 717272, alloy, new in frail envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451930231092,"sku":"PMA-HA717272A-01","price":12.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-01-03_11.48.10.jpg?v=1735933749"},{"product_id":"hamilton-factory-mainspring-for-20-0s-21-0-hamilton-factory-no-2921-steel","title":"Hamilton Factory Mainspring for 20\/0s \u0026 21\/0 Hamilton Factory No. 2921 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory Mainspring for 20\/0s \u0026amp; 21\/0 Movements, Factory No. 2921, steel, new in envelope. See images for precise characteristics. These were available in a couple of different strengths and those that I can supply can be found in the drop-down list. I likely have several of these so the one you get may vary slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":".065","offer_id":47959032103220,"sku":"PMA-HAM2921S-10","price":4.0,"currency_code":"USD","in_stock":true},{"title":".07","offer_id":47959032135988,"sku":"PMA-HAM2921S-11","price":4.0,"currency_code":"USD","in_stock":true},{"title":".075","offer_id":47959032168756,"sku":"PMA-HAM2921S-12","price":4.0,"currency_code":"USD","in_stock":true},{"title":"08","offer_id":47959032201524,"sku":"PMA-HAM2921S-13","price":4.0,"currency_code":"USD","in_stock":true},{"title":".085","offer_id":47959032234292,"sku":"PMA-HAM2921S-14","price":4.0,"currency_code":"USD","in_stock":true},{"title":".09","offer_id":48439032807732,"sku":"PMA-HAM2921S-15","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/929018750.jpg?v=1705276249"},{"product_id":"hamilton-factory-mainspring-for-12s-17j-hamilton-no-718072","title":"Hamilton Factory Mainspring for 12s 17j Hamilton No. 718072","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring \nfor 12s 17 Jewel Movements, #718072, new in envelope.  See \nimage for precise characteristics. I likely have several of these so the one you get may differ slightly from the images.  I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed.  \u003c\/span\u003eImages do a pretty good job of \nrepresenting the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451936063796,"sku":"PMA-HAM718072S-12","price":8.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/3389010344.jpg?v=1705276371"},{"product_id":"hamilton-dynavar-14-0s-factory-mainspring-717442-alloy","title":"Hamilton Dynavar 14\/0s Factory Mainspring No. 717442 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003cem\u003e\u003c\/em\u003e\u003c\/strong\u003e\u003cem\u003eDynavar \u003c\/em\u003eFactory Mainspring for 14\/0s Movements, Factory No. 717442, alloy, new in envelope. See images for further details. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451938160948,"sku":"PMA-HAM717442A-03","price":15.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2024-10-27_11.38.05.jpg?v=1757128424"},{"product_id":"hamilton-dynavar-14-0s-factory-mainspring-717441-alloy","title":"Hamilton Dynavar 14\/0s Factory Mainspring No. 717441 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003cem\u003e\u003c\/em\u003e\u003c\/strong\u003e\u003cem\u003eDynavar \u003c\/em\u003eFactory Mainspring for 14\/0s Movements (982, etc), Factory No. 717441, alloy, new in very frail envelope. See images for further details. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451939373364,"sku":"PMA-HAM717441A-03","price":17.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/1261923683.jpg?v=1705276636"},{"product_id":"hamilton-factory-dynavar-mainspring-for-22-0s-hamilton-no-717602-alloy","title":"Hamilton Factory Dynavar Mainspring for 22\/0s Hamilton No. 717602- Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory \u003cem\u003eDynavar\u003c\/em\u003e Mainspring for 22\/0s Movements (911, etc), Catalog No. 717602, alloy, new in frail envelope. Made for Grades 911 \u0026amp; 911M, and perhaps others. I likely have several of these so the one you get may not be identical in appearance but it will be the same factory Hamilton mainspring. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item. \u003cbr\u003e\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451939504436,"sku":"PMA-HAM717602A-10","price":6.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/946907094.jpg?v=1705276669"},{"product_id":"hamilton-factory-dynavar-mainspring-for-20-0-21-0s-hamilton-no-717530-alloy","title":"Hamilton Factory Dynavar Mainspring for 20\/0 \u0026 21\/0s Hamilton No. 717530- Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory \u003cem\u003eDynavar\u003c\/em\u003e Mainspring for 20\/0s \u0026amp; 21\/0s Movements, Catalog No. 717530, alloy, new in envelope. Made for Grades 995, 995A, 997 \u0026amp; 721 and perhaps others. See image for precise characteristics. I have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451948286260,"sku":"PMA-HAM717530A-01","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/976855671.jpg?v=1705277119"},{"product_id":"hamilton-factory-mainspring-for-0s-hamilton-no-1536-steel","title":"Hamilton Factory Mainspring for 0s Hamilton No. 1536 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory Mainspring for 0s Movements, No. 1536 (or 2118), steel, new in envelope. See images for precise mainspring specifications.  These were available in a couple of different strengths and those that I can supply can be found in the drop-down list. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":".145","offer_id":48910010253620,"sku":"PMA-HAM1536S-14","price":6.5,"currency_code":"USD","in_stock":true},{"title":".15","offer_id":48910010286388,"sku":"PMA-HAM1536S-14","price":7.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/1156669035.jpg?v=1705277192"},{"product_id":"hamilton-factory-16s-mainspring-factory-no-318-steel","title":"Hamilton Factory 16s Mainspring Factory No. 318 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring for 16s 17 Jewel Movements, Factory No. 318, steel, new in likely very frail envelope. See images for precise specifications including strength. I likely have several of these so the one you get may differ slightly from the images but it will be the strength shown. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451951530292,"sku":"PMA-HAM0318S-04","price":17.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/998929846.jpg?v=1705277507"},{"product_id":"hamilton-factory-mainspring-for-18-0s-hamilton-no-718501-steel","title":"Hamilton Factory Mainspring for 18\/0s Hamilton No. 718501 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e\u003cstrong\u003e \u003c\/strong\u003eFactory\u003cstrong\u003e \u003c\/strong\u003e\u003cem\u003e\u003c\/em\u003e Mainspring for 18\/0s Hamilton 17j Movements, Factory No. 718501, steel, new in possibly frail envelope.  See image for precise characteristics. The old number for this mainspring was 2721, which I also sell, these just likely have a significantly newer manufacturing date.  I likely have several of these so the one you get may differ slightly from the images.  I specialize in hard to find watch parts and all watch parts are \nunconditionally guaranteed. Images do a pretty good job of representing \nthe item.\u003cbr\u003e\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451957068084,"sku":"PMA-HA718501S-05","price":5.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/1020965177.jpg?v=1705277833"},{"product_id":"hamilton-factory-dynavar-mainspring-for-21-0s-hamilton-no-717570-alloy","title":"Hamilton Factory Dynavar Mainspring for 21\/0s Hamilton No. 717570 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory \u003cem\u003eDynavar\u003c\/em\u003e Mainspring for 21\/0s Movements, Catalog No. 717570, alloy, new in envelope. Made for Grades 75, 77, 750, 751, 756, 757, 761, 780 and perhaps others. See image for precise characteristics. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451958051124,"sku":"PMA-HAM717570A-03","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/1023429415.jpg?v=1705277873"},{"product_id":"hamilton-factory-mainspring-for-6-0s-hamilton-no-717201-alloy","title":"Hamilton Factory Mainspring for 6\/0s Hamilton No. 717201 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e\u003cstrong\u003e \u003c\/strong\u003eFactory\u003cstrong\u003e \u003c\/strong\u003e\u003cem\u003e\u003c\/em\u003e Mainspring for 6\/0s Hamilton 17j Movements, Factory No. 717201, alloy, new in distressed envelope. See image for precise mainspring specifications. These are basically equivalent to the 2521 in steel and are also known by the old Hamilton #27433. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a marginally adequate job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451959034164,"sku":"PMA-HA717201A-01","price":17.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-07-14_15.53.47.jpg?v=1752533654"},{"product_id":"hamilton-factory-dynavar-mainspring-for-6-0-hamilton-no-27433-alloy","title":"Hamilton Factory Dynavar Mainspring for 6\/0 Hamilton No. 27433 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory \u003cem\u003eDynavar\u003c\/em\u003e Mainspring for 6\/0s Movements, Factory No. 27433, alloy, new in envelope.  See image for precise characteristics. I likely have several of these so the one you get may differ slightly from the images.  I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a satisfactory job of representing the item. \u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451967258932,"sku":"PMA-HAM27433A-05","price":17.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-02-08_15.06.13.jpg?v=1739055998"},{"product_id":"hamilton-factory-dynavar-mainspring-for-21-0s-hamilton-grades-750-751-756-757-no-46432-alloy","title":"Hamilton Factory Dynavar Mainspring for 21\/0s Hamilton Grades 750, 751, 756, 757 No. 46432 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory \u003cem\u003eDynavar\u003c\/em\u003e Mainspring for 21\/0s Movements, Grades 750, 751, 765, 757, Factory No. 46432 \/ 717571, alloy, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. \u003c\/span\u003eImages do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451979743540,"sku":"PMA-HAM46432A-05","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/1064381979.jpg?v=1705278331"},{"product_id":"hamilton-factory-dynavar-mainspring-for-22-0s-hamilton-no-717600-alloy","title":"Hamilton Factory Dynavar Mainspring for 22\/0s Hamilton No. 717600- Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton\u003c\/strong\u003e Factory \u003cem\u003eDynavar\u003c\/em\u003e Mainspring for 22\/0s Movements, Catalog No. 717600, alloy, new in envelope. Made for Grades 911 \u0026amp; 911M, and perhaps others. I likely have several of these so the one you get may not be identical in appearance but it will be the same factory Hamilton mainspring. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item. \u003cbr\u003e\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451980497204,"sku":"PMA-HAM717600A-05","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/1064677055.jpg?v=1705278352"},{"product_id":"hamilton-factory-mainspring-for-14-0s-hamilton-factory-no-5021-steel","title":"Hamilton Factory Mainspring for 14\/0s Hamilton Factory No. 5021 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring \nfor 14\/0s 17 - 19 Jewel Movements, Factory No. 5021, steel, new in envelope.  See \nimages for precise characteristics.   I likely have several of these so the one you get may differ slightly from the images.  I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed.  \u003c\/span\u003eImages do a pretty good job of \nrepresenting the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451981283636,"sku":"PMA-HAM5021S-06","price":5.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/1080379632.jpg?v=1705278361"},{"product_id":"hamilton-factory-mainspring-for-6-0s-17j-hamilton-no-718201","title":"Hamilton Factory Mainspring for 6\/0s 17j Hamilton No. 718201 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring for 6\/0s 17 Jewel Movements, Factory No. 718201, steel, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize i\u003cspan style=\"font-size: 14px;\"\u003en hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. \u003c\/span\u003eImages do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Hamilton","offers":[{"title":"Default Title","offer_id":47451985314100,"sku":"PMA-HAM718201S-05","price":8.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/2654634828.jpg?v=1705278411"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/collections\/509411543.jpg?v=1705269628","url":"https:\/\/www.vintagetimeparts.com\/collections\/hamilton.oembed?page=6","provider":"Vintage Time Parts","version":"1.0","type":"link"}