{"product_id":"newall-mainspring-136n-for-gruen-313-341-342-343-820-821-alloy","title":"NEWALL Mainspring #136N for Gruen 313, 341, 342, 343, 820, 821 - Alloy","description":"\u003cp\u003e\u003cb\u003eNEWALL \u003c\/b\u003eN-DUR-ALL alloy mainspring #136N for Gruen 313, 341, 342, 343, 820, 821, Enicar 90 caliber movements plus perhaps many others, 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":"NEWALL","offers":[{"title":"Default Title","offer_id":48638404002100,"sku":"PMS-NEW0136NA-06","price":7.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-06-2311.08.21.jpg?v=1750702335","url":"https:\/\/www.vintagetimeparts.com\/products\/newall-mainspring-136n-for-gruen-313-341-342-343-820-821-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}