{"product_id":"usr-mainspring-for-hamilton-16s-no-317-steel","title":"USR Mainspring for Hamilton 16s No. 318 - Steel","description":"\u003cp\u003e\u003cstrong\u003eUSR \u003c\/strong\u003eMainspring for \u003cstrong\u003eHamilton\u003c\/strong\u003e 16s Pocket Watches, Factory No. 318, new in very distressed envelope or perhaps almost no envelope at all due to disintegration. Because the envelope is either open or torn they're dusty so they'll need a good cleaning before, but all mainsprings should be cleaned before use anyhow. USR is short for Ulysse Sandoz-Robert of La Chaux-de-Fonds, Switzerland. I specialize in 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":"USR","offers":[{"title":"Default Title","offer_id":48876652495156,"sku":"PMA-USR0318S-09","price":7.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-08-2812.38.46.jpg?v=1756410152","url":"https:\/\/www.vintagetimeparts.com\/products\/usr-mainspring-for-hamilton-16s-no-317-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}