Comsco Mainspring #1075A for Elgin 10s No. 5726 - Steel

Comsco Mainspring #1075A for Elgin 10s Movements, Factory No. 5726, steel, new in envelope. See image 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 pretty good job of representing the item.