Comsco Mainspring #2079 for Elgin 0s Factory No. 825 - Steel

Comsco Mainspring #2079 for Elgin 0s Movements, Factory No. 825, steel, new in envelope. Distributed by Burton M. Reid and Sons. See image for specifications and 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.