{"product_id":"perma-loy-unbreakable-mainspring-for-gruen-405-406-alloy","title":"PERMA-LOY Unbreakable Mainspring for Gruen 405, 406 - Alloy","description":"\u003cp\u003e\u003cstrong\u003ePERMA-LOY\u003c\/strong\u003e \u003cem\u003eUnbreakable\u003c\/em\u003e Mainspring for \u003cstrong\u003eGruen\u003c\/strong\u003e caliber 405, 406 movements and other Gruen calibers as well, alloy, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ very sightly from the images. I specialize in 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":"PERMA-LOY","offers":[{"title":"Default Title","offer_id":49154766045492,"sku":"PMS-PERMA405A-06","price":7.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-06-0915.50.18.jpg?v=1781045498","url":"https:\/\/www.vintagetimeparts.com\/products\/perma-loy-unbreakable-mainspring-for-gruen-405-406-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}