Comsco Mainspring #2191 for 11/0s Hampden Factory No. 11696 - Steel

Comsco Mainspring #2191 for 11/0s Hampden movements, Factory No. 11696, steel, new in envelope. See images for precise mainspring specifications. 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.