Comsco Mainspring #1149 for 12s Illinois No. 47349 - Steel

Comsco Mainspring #1149 for Illinois 12s movements, Factory No. 47349, 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 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.