{"product_id":"hr-quick-fit-mainspring-k635-for-hanhart-caliber-50-51-52-54-chronograph-alloy","title":"HR Quick Fit Mainspring K635 for Hanhart caliber 50, 51, 52, 54 Chronograph - 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 K635 for \u003cstrong\u003eHanhart \u003c\/strong\u003ecaliber 50, 51, 52, 54 Chronograph movements, white alloy, new in envelope. See images for precise mainspring specifications and ignore the reference to AS 1032 as I don't see how this mainspring would ever fit that movement. 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. \u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"HR","offers":[{"title":"Default Title","offer_id":49310144299316,"sku":"PMS-HRQFK635A-10","price":20.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-10-0314.50.22.jpg?v=1791064533","url":"https:\/\/www.vintagetimeparts.com\/products\/hr-quick-fit-mainspring-k635-for-hanhart-caliber-50-51-52-54-chronograph-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}