{"product_id":"hr-quick-fit-mainspring-ka37e-for-rolex-620-630-automatics-alloy","title":"HR Quick Fit Mainspring KA37E for Rolex 620, 630 Automatics - Alloy","description":"\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cstrong\u003eHR \u003c\/strong\u003e\u003cem\u003eQuick Fit\u003c\/em\u003e\u003cstrong\u003e \u003c\/strong\u003eMainspring KA37E for \u003cstrong\u003eRolex\u003c\/strong\u003e\u003cstrong\u003e \u003c\/strong\u003ecaliber 620, 630, automatic, with attached bridle, white alloy, new in envelope. See images for precise mainspring specifications. 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\/span\u003e\u003c\/p\u003e","brand":"HR","offers":[{"title":"Default Title","offer_id":49099168776500,"sku":"PMS-HRQFKSA37EA-04","price":20.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-04-1613.40.24.jpg?v=1776372159","url":"https:\/\/www.vintagetimeparts.com\/products\/hr-quick-fit-mainspring-ka37e-for-rolex-620-630-automatics-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}