Marco Mainspring #141 for 10s Elgin Factory No. 5726 - Steel

Marco Mainspring #141 for Elgin 10s, Factory No. 5726, steel, new in envelope. See images for further information. 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.