{"product_id":"marco-mainspring-3136-for-derby-caliber-67-steel","title":"Marco Mainspring #3136 for Derby caliber 67 - Steel","description":"\u003cp\u003e\u003cspan style=\"font-size: 14px;\"\u003e\u003cstrong\u003eMarco \u003c\/strong\u003eMainspring No. 3136 for \u003cstrong\u003eDerby\u003c\/strong\u003e 67 caliber movements, and perhaps other similar ébauche watches, steel, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. 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 an adequate job of representing the item. \u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"C \u0026 E Marshall","offers":[{"title":"Default Title","offer_id":49073411391796,"sku":"PMS-CEM3136S-04","price":6.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-03-2814.05.20.jpg?v=1774732069","url":"https:\/\/www.vintagetimeparts.com\/products\/marco-mainspring-3136-for-derby-caliber-67-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}