{"product_id":"marco-mainspring-3123-for-longines-caliber-5-16-4l-steel","title":"Marco Mainspring #3123 for Longines Caliber 5.16 (4L) - Steel","description":"\u003cp\u003e\u003cstrong\u003eMarco \u003c\/strong\u003eMainspring \u003cstrong\u003e\u003c\/strong\u003e#3123 for \u003cstrong\u003eLongines\u003c\/strong\u003e caliber 5.16 or 4L movements, and perhaps others, T-end, steel, 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 an adequate job of representing the item.\u003c\/p\u003e","brand":"C \u0026 E Marshall","offers":[{"title":"Default Title","offer_id":49040352772404,"sku":"PMS-CEM3123S-02","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-02-1212.38.16.jpg?v=1770929095","url":"https:\/\/www.vintagetimeparts.com\/products\/marco-mainspring-3123-for-longines-caliber-5-16-4l-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}