Comsco Mainspring #1189 for 3/0s Hampden Factory No. 9696 - Steel

Comsco Mainspring #1189 for 3/0s Hampden movements, Factory No. 9696, steel, new in frail 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.