Comsco Mainspring #1178 for Hampden 16s Factory No. 2696 - Steel

Comsco Mainspring No.1178 for Hampden 16s Model 1890 movements, Factory No. 2696, steel, new in envelope. See image for precise 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.