WATCH-CRAFT Mainspring 3874W for MST 374, 375, 377, 379, 384, 385, 393, 394, 403, 404, 405, 406 - Alloy

WATCH-CRAFT Mainspring 3874W for Helbros 53, Jeambrun 415PS, 451, Lemania 196, Lorsa 49R, MST 374, 375, 377, 379, 384, 385, 393, 394, 403, 404, 405, 406, Oris 470, Otero 87, 95 caliber movements, white alloy, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.