Elgin Factory Magistral Super Mainspring for 12s No. 6084 (1720) - Alloy

Elgin Magistral Super Factory Mainspring for 12s movements, Factory No. 6084-.0075, alloy, new in envelope. Basically this is the factory alloy version of the steel 1720. See image for further details and precise mainspring specifictions. I likely have several of these so the one you get may differ very 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.