{"product_id":"watch-craft-mainspring-3053w-for-gruen-139-m-favre-139-unitas-190-192-alloy","title":"WATCH-CRAFT Mainspring 3053W for Gruen 139, M. Favre 139, Unitas 192 - Alloy","description":"\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cstrong\u003eWATCH-CRAFT \u003c\/strong\u003eMainspring 3053W for Gruen 139, Marc Favre 139, Unitas 192 caliber movements plus perhaps 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 a satisfactory job of representing the item. \u003c\/span\u003e\u003c\/p\u003e","brand":"C \u0026 E Marshall","offers":[{"title":"Default Title","offer_id":49074582520116,"sku":"PMS-CEM3053WA-04","price":7.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-03-3111.33.46.jpg?v=1774982201","url":"https:\/\/www.vintagetimeparts.com\/products\/watch-craft-mainspring-3053w-for-gruen-139-m-favre-139-unitas-190-192-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}