{"product_id":"marco-mainspring-3061-for-alpina-490-belforte-11c-eta-735-cortebert-635-steel","title":"Marco Mainspring #3061 for Alpina 490, Belforte 11C, ETA 735, Cortebert 635 - Steel","description":"\u003cp\u003e\u003cstrong\u003eMarco \u003c\/strong\u003esteel mainspring #3061 for Alpina 490, Belforte 11C, ETA 735, Cortebert 635 caliber movements and quite likely many others. See images for 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":"C \u0026 E Marshall","offers":[{"title":"Default Title","offer_id":49005016809780,"sku":"PMS-CEM3061S-01","price":6.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-01-2311.55.20.jpg?v=1769198410","url":"https:\/\/www.vintagetimeparts.com\/products\/marco-mainspring-3061-for-alpina-490-belforte-11c-eta-735-cortebert-635-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}