{"product_id":"hamilton-mainspring-for-12-l-grade-628-alloy","title":"Hamilton Mainspring for 12½L Grade 628, 629, 630 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eMainspring for 12½ ligne Swiss Made Automatic Movements Grade 628 plus likely related calibers (629, 630), alloy with attached bridle, new in envelope. See images for further details. The grade 628 is a Buren base caliber 1282 movement therefore this mainspring will for more than just the specified Hamilton grades. 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 good job of representing the item.\u003c\/p\u003e","brand":"HR","offers":[{"title":"Default Title","offer_id":49353850945844,"sku":"PMA-HRQFKA9A-10","price":17.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-10-2916.01.03.jpg?v=1793315470","url":"https:\/\/www.vintagetimeparts.com\/products\/hamilton-mainspring-for-12-l-grade-628-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}