Marco Mainspring #111 for 16s Elgin Factory No. 817 - Steel

Marco Mainspring #111 for Elgin 16s movements, Factory No. 817, steel, new 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 in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.