{"product_id":"hr-nivastar-mainspring-g310-for-roamer-caliber-300-301-alloy","title":"HR Nivastar Mainspring G310 for Roamer caliber 300, 301 - Alloy","description":"\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cstrong\u003eHR \u003c\/strong\u003e\u003cem\u003eNivastar \u003c\/em\u003eMainspring G310 for Roamer caliber 300, 301 movements plus perhaps many more similar ébauche watches, white alloy, new in 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 is hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item. \u003c\/span\u003e\u003c\/p\u003e","brand":"HR","offers":[{"title":"Default Title","offer_id":49131902665012,"sku":"PMS-HRNSG310A-05","price":8.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-05-1912.24.38.jpg?v=1779218783","url":"https:\/\/www.vintagetimeparts.com\/products\/hr-nivastar-mainspring-g310-for-roamer-caliber-300-301-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}