{"product_id":"marco-marshalloy-mainspring-3273m-for-longines-15-18-15-23-champ-21-9-concord-487-alloy","title":"Marco Marshalloy Mainspring 3273M for Longines 15.18, 15.23, Champ 21-9, Concord 487 - Alloy","description":"\u003cp\u003e\u003cb\u003eMarco \u003c\/b\u003e\u003cem\u003eMarshalloy\u003c\/em\u003e\u003cb\u003e \u003c\/b\u003eMainspring 3273M for Longines 15.18, 15.23, Champ 21-9, Concord 487 caliber movements and perhaps other similar movements, typical Longines T-Brace end, 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":49066492264756,"sku":"PMS-CEM3273MA-03","price":7.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-03-1917.17.19.jpg?v=1773965865","url":"https:\/\/www.vintagetimeparts.com\/products\/marco-marshalloy-mainspring-3273m-for-longines-15-18-15-23-champ-21-9-concord-487-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}