{"product_id":"hamilton-factory-mainspring-for-16s-movements-no-318-718043-alloy","title":"Hamilton Factory Mainspring for 16s movements No. 318 \/ 718043 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eFactory Mainspring for 16s 17 Jewel Movements, Factory No. 718043 (318), 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 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":49134171586868,"sku":"PMA-HA718043A-05","price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-05-20_19.52.35.jpg?v=1779332036","url":"https:\/\/www.vintagetimeparts.com\/products\/hamilton-factory-mainspring-for-16s-movements-no-318-718043-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}