{"product_id":"nivaflex-unbreakable-mainspring-n6387-for-lanco-1036-1136-mst-371-372-oris-450-451-452-453-alloy","title":"Nivaflex Unbreakable Mainspring N6387 for Lanco 1036, 1136, MST 371, 372, Oris 450, 451, 452, 453 - Alloy","description":"\u003cp\u003e\u003cstrong\u003eNivaflex\u003c\/strong\u003e Unbreakable Mainspring N 6387 for Langendorf 1036, 1136, MST 371, 372, Oris 450, 451, 452, 453, Reconvillier 120 caliber movements plus perhaps other similar \u003cspan class=\"st\"\u003eébauche\u003c\/span\u003e movements as well, alloy, new in envelope. See images for all supported calibers and 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":"Nivaflex","offers":[{"title":"Default Title","offer_id":48610802663732,"sku":"PMS-NIVAN6387A-06","price":7.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-06-0318.02.26.jpg?v=1748999381","url":"https:\/\/www.vintagetimeparts.com\/products\/nivaflex-unbreakable-mainspring-n6387-for-lanco-1036-1136-mst-371-372-oris-450-451-452-453-alloy","provider":"Vintage Time Parts","version":"1.0","type":"link"}