{"product_id":"cas-ker-mainspring-ja743-for-12s-waltham-colonial-b-factory-no-2237-2267-alloy","title":"Cas-Ker Mainspring JA743 for 12s Waltham Colonial B Factory No. 2237 \/ 2267 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eCas-Ker\u003c\/strong\u003e Mainspring MS-JA743 for 12s \u003cstrong\u003eWaltham\u003c\/strong\u003e Colorial B movements, Factory No. 2237 \/  2267, almost certainly made by Bestfit, new in sealed package. 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 and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003cbr\u003e\u003c\/p\u003e","brand":"BESTFIT","offers":[{"title":"Default Title","offer_id":49167735193908,"sku":"PMA-MSJA743A-06","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-06-1915.13.51.jpg?v=1781907452","url":"https:\/\/www.vintagetimeparts.com\/products\/cas-ker-mainspring-ja743-for-12s-waltham-colonial-b-factory-no-2237-2267-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}