Marco Mainspring #138 for 12s Elgin Corsican Factory No. 2874 - Steel

Marco Mainspring #138 for 12s Elgin Streamline model Corsican Grade movements, Factory No. 2874, DB&H end, steel, new in envelope. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. See image for precise characteristics. Images do a pretty good job of representing the item.