{"product_id":"hr-mainspring-a229-for-hamilton-20-0s-21-0s-no-2921-steel","title":"HR Mainspring A229 for Hamilton 20\/0s \u0026 21\/0s No. 2921 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHR\u003c\/strong\u003e Mainspring A229 for \u003cstrong\u003eHamilton \u003c\/strong\u003e\u003cstrong\u003e\u003cem\u003e\u003c\/em\u003e\u003c\/strong\u003e20\/0s \u0026amp; 21\/0s movements, Factory No. 2921, steel, new in envelope. See images for precise mainspring specifications. 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":"HR","offers":[{"title":"Default Title","offer_id":49063230406964,"sku":"PMA-HRA229S-03","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-03-1512.07.40.jpg?v=1773601804","url":"https:\/\/www.vintagetimeparts.com\/products\/hr-mainspring-a229-for-hamilton-20-0s-21-0s-no-2921-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}