{"product_id":"hr-nivastar-mainspring-g545-for-aurore-42-marvin-520-535-wittnauer-11t-alloy","title":"HR Nivastar Mainspring G545 for Aurore 42, Marvin 520, 535, Wittnauer 11T - Alloy","description":"\u003cp\u003e\u003cstrong\u003eHR \u003c\/strong\u003e\u003cem\u003eNivastar\u003c\/em\u003e\u003cstrong\u003e \u003c\/strong\u003eMainspring G545 for Aurore 42, Marvin 520, 535, Kurth 23 - 20, Wittnauer 11T caliber movements plus perhaps many others, alloy, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ sightly from the images. 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":48996883759412,"sku":"PMS-HRNSG545A-01","price":7.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-01-1416.27.49.jpg?v=1768437018","url":"https:\/\/www.vintagetimeparts.com\/products\/hr-nivastar-mainspring-g545-for-aurore-42-marvin-520-535-wittnauer-11t-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}