{"product_id":"marco-marshalloy-mainspring-2757m-for-gruen-266-700-701-702-703-704-705-alloy","title":"Marco Marshalloy Mainspring 2757M for AS 922, 1280, 1287, MST 352, 371 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eMarco \u003c\/strong\u003e\u003cem\u003eMarshalloy\u003c\/em\u003e Mainspring 2757M for AS 922, 1280, 1287, MST 352, 371 caliber movements and perhaps others, white alloy, new in envelope. See images for precise mainspring specifications. I likely have several of these so the 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 pretty good job of representing the item.\u003c\/p\u003e","brand":"C \u0026 E Marshall","offers":[{"title":"Default Title","offer_id":48906855186740,"sku":"PMS-CEM2757MA-05","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-05-20_19.20.48.jpg?v=1779330094","url":"https:\/\/www.vintagetimeparts.com\/products\/marco-marshalloy-mainspring-2757m-for-gruen-266-700-701-702-703-704-705-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}