Marco Mainspring #133 for 12s Elgin Factory No. 2874 - Steel

Marco Mainspring #133 for 12s Elgin 17 - 19j movements, Factory No. 2874, DB&H end, steel, new in frail envelope. See images for further details.  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.