{"product_id":"hr-mainspring-no-423-for-as-caliber-1234-steel","title":"HR Mainspring No. 423 for AS caliber 1234 - Steel","description":"\u003cp\u003e\u003cstrong\u003eHR \u003c\/strong\u003eMainspring\u003cstrong\u003e \u003c\/strong\u003eNo. 423 Mainspring for AS caliber 1234 movements, plus perhaps others (Bulova 5AD perhaps), steel, new in envelope. See images for precise mainspring specifications.  I specialize is hard to find watch parts so I usually have whatever you might need 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":49135088763188,"sku":"PMS-HRMS423S-05","price":6.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-05-2212.35.14.jpg?v=1779478679","url":"https:\/\/www.vintagetimeparts.com\/products\/hr-mainspring-no-423-for-as-caliber-1234-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}