Comsco Mainspring #1153 for 12s Illinois No. 47345 - Steel

Comsco Mainspring #1153 for 12s Illinois, Factory No. 47345, T brace, 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 and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.