{"product_id":"nivaflex-mainspring-for-gruen-caliber-115-405-406-410-411-etc-alloy","title":"HR Nivaflex Mainspring G211 for Gruen caliber 115, 405, 406, 410, 411, etc - Alloy","description":"\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cstrong\u003eHR \u003c\/strong\u003e\u003cem\u003eNivaflex\u003c\/em\u003e\u003cstrong\u003e \u003c\/strong\u003eMainspring G211 for \u003cstrong\u003eGruen\u003c\/strong\u003e caliber 115, 405, 406, 410, 411, 420, 421, 426 plus perhaps more Gruens and similar ébauche watches, white alloy, new in frail envelope. See images for precise mainspring specifications. 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. \u003c\/span\u003e\u003c\/p\u003e","brand":"HR","offers":[{"title":"Default Title","offer_id":48880349544756,"sku":"PMS-HRNFG211A-12","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-09-0111.42.15.jpg?v=1756752293","url":"https:\/\/www.vintagetimeparts.com\/products\/nivaflex-mainspring-for-gruen-caliber-115-405-406-410-411-etc-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}