{"product_id":"jurgensen-mainspring-664a-for-hamilton-8-0s-no-7221-steel","title":"Jurgensen Mainspring #664A for Hamilton 8\/0s No. 7221 - Steel","description":"\u003cp\u003e\u003cstrong\u003eJurgensen \u003c\/strong\u003eMainspring No. 664A for \u003cstrong\u003eHamilton\u003c\/strong\u003e 8\/0s movements, Factory No 7221, 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 and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.\u003c\/p\u003e","brand":"Jurgensen","offers":[{"title":"Default Title","offer_id":49139332383028,"sku":"PMA-JURG0664AS-05","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-05-2713.28.12.jpg?v=1779913807","url":"https:\/\/www.vintagetimeparts.com\/products\/jurgensen-mainspring-664a-for-hamilton-8-0s-no-7221-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}