Marco Mainspring #529 for 12s Illinois Factory No. 47343 - Steel

Marco Mainspring #529 for 12s Illinois, Factory No. 47343, steel, new in envelope. See images for precise specifications. 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. Images do a pretty good job of representing the item.