{"product_id":"marco-mainspring-2937-for-gruen-veri-thin-v-1-2-4-steel","title":"Marco Mainspring #2937 for Gruen Veri-Thin V, 1½, 2½, 4 - Steel","description":"\u003cp\u003e\u003cstrong\u003eMarco \u003c\/strong\u003eMainspring No. 2937 for Gruen caliber V, 1½, 2½, 4 Veri-Thin and A. Michel caliber 520, 560 movements and perhaps other similar ébauche watches as well, 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":"C \u0026 E Marshall","offers":[{"title":"Default Title","offer_id":48894252745012,"sku":"PMS-CEM2937S-09","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0849\/3341\/1124\/files\/2025-09-1410.31.48.jpg?v=1757871199","url":"https:\/\/www.vintagetimeparts.com\/products\/marco-mainspring-2937-for-gruen-veri-thin-v-1-2-4-steel","provider":"Vintage Time Parts","version":"1.0","type":"link"}