{"product_id":"swartchild-black-shield-mainspring-440761-for-hamilton-12s-no-3328-steel","title":"Swartchild Black Shield Mainspring 440761 for Hamilton 12s No. 3328 - Steel","description":"\u003cp\u003e\u003cstrong\u003eSwartchild \u003c\/strong\u003e\u0026amp; Co \u003cem\u003eBlack Shield\u003c\/em\u003e Mainspring No.440761 for \u003cstrong\u003eHamilton \u003c\/strong\u003e12s movements, Factory No. 3328, steel, new in envelope. See images for further details. 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 suitable job of representing the item.\u003c\/p\u003e","brand":"Swartchild","offers":[{"title":"Default Title","offer_id":49266647892276,"sku":"PMA-SW440761S-08","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-08-2411.24.58.jpg?v=1787596015","url":"https:\/\/www.vintagetimeparts.com\/products\/swartchild-black-shield-mainspring-440761-for-hamilton-12s-no-3328-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}