{"product_id":"kilb-beck-mainspring-3910-for-hamilton-12s-no-1228-3028-steel","title":"Kilb-Beck Mainspring #3910 for Hamilton 12s No. 1228 \/ 3028 - Steel","description":"\u003cp\u003e\u003cstrong\u003eKilk-Beck \u003c\/strong\u003eCompany\u003cstrong\u003e \u003c\/strong\u003e\u003cem\u003e\u003c\/em\u003eMainspring #3910 for 12s \u003cstrong\u003eHamilton \u003c\/strong\u003emovements, Factory No. 1228 \/ 3028, steel, new in envelope. See images for precise mainspring specifications. Notice the GENUINE and\/or Genuine Factory marked on the envelope, which means it's a factory mainspring. I likely have several of thee so the one you get may differ slightly from the images.  I specialize is 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":"Kilb Beck Company","offers":[{"title":"Default Title","offer_id":47452758769972,"sku":"PMA-KBK3910S-12","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/3388872254.jpg?v=1705293727","url":"https:\/\/www.vintagetimeparts.com\/products\/kilb-beck-mainspring-3910-for-hamilton-12s-no-1228-3028-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}