{"product_id":"hr-evrlast-mainspring-e621-for-ff60-kurth-257-benrus-bi-bm-steel","title":"HR Ev-R-Last Mainspring E621 for FF60, Kurth 257, Benrus BI \u0026 BM - Steel","description":"\u003cp\u003e\u003cstrong\u003eHR Ev-R-last\u003c\/strong\u003e mainspring No E621 for Benrus caliber BI \u0026amp; BM, FF caliber 60, Peseux caliber 220 and Kurth caliber 257 plus perhaps other movements as well, steel, new in envelope. See images for further details and 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. \u003c\/p\u003e","brand":"HR","offers":[{"title":"Default Title","offer_id":47451991966004,"sku":"PMS-HRE621S-06","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/products\/1086843363.jpg?v=1705278820","url":"https:\/\/www.vintagetimeparts.com\/products\/hr-evrlast-mainspring-e621-for-ff60-kurth-257-benrus-bi-bm-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}