Comsco Mainspring #1088 for Elgin 26/0s Factory No. 5131 - Steel

Comsco Mainspring #1088 for Elgin 26/0s Movements, Factory No. 5131, 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.