Comsco Mainspring #1069 for Elgin 12s Factory No. 1712 - Steel

Comsco Mainspring #1069 for Elgin 12s Movements, Factory No. 1712, steel, new in dirty envelope. Distributed by Burton M. Reid and Sons. See images for precise mainspring specifications and further details. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a marginally adequate job of representing the item.