Comsco Mainspring #1185 for 12s Hampden Factory No. 7696 - Steel

Comsco Mainspring #1185 for 12s Hampden movements, Factory No. 7696, 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 an adequate job of representing the item.