{"product_id":"marco-marshalloy-mainspring-2863m-for-gruen-818-819-and-rolex-357-600-alloy","title":"Marco Marshalloy Mainspring 2863M for Gruen 818, 819, Alpina 819, Rolex 357, 600 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eMarco\u003c\/strong\u003e \u003cem\u003eMarshalloy\u003c\/em\u003e Mainspring for Gruen 818, 819, Alpina 819, Rolex 357, 600 caliber movements plus perhaps other similar \u003cspan class=\"st\"\u003eébauche\u003c\/span\u003e movements as well, white alloy, new in envelope. 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":49099365286196,"sku":"PMS-CEM2863MA-04","price":20.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-04-1619.26.20.jpg?v=1776393027","url":"https:\/\/www.vintagetimeparts.com\/products\/marco-marshalloy-mainspring-2863m-for-gruen-818-819-and-rolex-357-600-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}