{"product_id":"marco-mainspring-4159a-for-16s-hampden-3696-steel","title":"Marco Mainspring #311 for 16s Hampden No. 3696 - Steel","description":"\u003cp\u003e\u003cstrong\u003eMarco\u003c\/strong\u003e Mainspring #311 for 16s \u003cstrong\u003eHampden\u003c\/strong\u003e\u003cstrong\u003e \u003c\/strong\u003eBridge Model 1902 to 08 Pocket Watches (not the ¾ plate), Factory No. 3696, T-end, 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 is hard to find watch parts 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":47451768521012,"sku":"PMA-CEM0311S-05","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-04-3013.51.43.jpg?v=1746046469","url":"https:\/\/www.vintagetimeparts.com\/products\/marco-mainspring-4159a-for-16s-hampden-3696-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}