{"product_id":"hamilton-12s-mainspring-1228-exact-alloy","title":"Hamilton 12s Mainspring No. 1228 \/ 3028 (EXACT) - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHamilton \u003c\/strong\u003eEXACT Mainspring for 12s Movements, Factory No. 1228 \/ 3028, alloy, 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":"EXACT","offers":[{"title":"Default Title","offer_id":47452349825332,"sku":"PMA-EXA1228A-09","price":12.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-11-13_08.42.13.jpg?v=1763052188","url":"https:\/\/www.vintagetimeparts.com\/products\/hamilton-12s-mainspring-1228-exact-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}