{"product_id":"usr-mainspring-for-hampden-16s-no-3696-steel","title":"USR Mainspring for Hampden 16s No. 3696 - Steel","description":"\u003cp\u003e\u003cstrong\u003eUSR \u003c\/strong\u003eMainspring for \u003cstrong\u003eHamilton\u003c\/strong\u003e 16s 3\/4 Plate Pocket Watches (Wm McKinley), Factory No. 3693, steel, new in envelope. Because the envelope either open or perhaps torn, they're usually pretty 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":49303850811700,"sku":"PMA-USR3693S-09","price":12.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-09-2717.18.38.jpg?v=1790554983","url":"https:\/\/www.vintagetimeparts.com\/products\/usr-mainspring-for-hampden-16s-no-3696-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}