{"product_id":"gruen-factory-mainspring-for-caliber-290-291-alloy","title":"Gruen Factory Mainspring for caliber 290, 291 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eGruen \u003c\/strong\u003eFactory\u003cstrong\u003e \u003c\/strong\u003emainspring for caliber 290, 291 movements and perhaps others, alloy, new in sealed package. I likely have several of the so the one you get may differ slightly from the images but they are all the same mainspring. 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":"Gruen","offers":[{"title":"Default Title","offer_id":49070298825012,"sku":"PMS-GRU0290A-03","price":7.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-03-2317.28.53.jpg?v=1774312275","url":"https:\/\/www.vintagetimeparts.com\/products\/gruen-factory-mainspring-for-caliber-290-291-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}