Comsco Mainspring #1190 for 8/0s Hampden Factory #15696 - Steel

Comsco Mainspring #1190 for 8/0s Hampden movements, including the Mary Jane & Josephine, Factory No. 15696, steel, new in envelope. See images for further details. 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.