{"product_id":"newall-security-mainspring-309-for-longines-10-39-caliber-movement-steel","title":"Newall Security Mainspring #309 for Longines 10.39 caliber movement - Steel","description":"\u003cp\u003e\u003cstrong\u003eNewall \u003c\/strong\u003e\u003cem\u003eSecurity\u003c\/em\u003e\u003cstrong\u003e \u003c\/strong\u003eMainspring No. 309 for \u003cstrong\u003eLongines\u003c\/strong\u003e\u003cstrong\u003e \u003c\/strong\u003ecaliber 10.39 movements and perhaps other wrist watches as well, Longines T-end, steel, new in envelope. See images for precise mainspring specifications. 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":"Newall","offers":[{"title":"Default Title","offer_id":49119189664052,"sku":"PMS-NEW309S-05","price":4.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2026-04-3012.27.20.jpg?v=1777577402","url":"https:\/\/www.vintagetimeparts.com\/products\/newall-security-mainspring-309-for-longines-10-39-caliber-movement-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}