Marco Mainspring #158 for Elgin 0s Factory No. 825 - Steel

Marco Mainspring #158 for Elgin 0s 7j, Factory No. 825, steel, 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 is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.