{"product_id":"marco-mainspring-3886m-for-elgin-grade-857-winton-92-17-font-2124-alloy","title":"Marco Marshalloy Mainspring 3886M for Elgin 857, Winton 92-17, Zentra 76, Font 2124 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eMarco\u003c\/strong\u003e \u003cem\u003eMarshalloy\u003c\/em\u003e Mainspring 3886M for Elgin Grade 857, Winton caliber 92-17, Zentra caliber 76 movements which are all Font caliber 2124 based movements, white alloy, new in envelope. See images for precise mainspring specifications. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.\u003c\/p\u003e","brand":"C \u0026 E Marshall","offers":[{"title":"Default Title","offer_id":48892014985524,"sku":"PMS-CEM3886MA-09","price":15.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-09-1211.36.55.jpg?v=1757702241","url":"https:\/\/www.vintagetimeparts.com\/products\/marco-mainspring-3886m-for-elgin-grade-857-winton-92-17-font-2124-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}