Elgin Factory Magistral Super Mainspring for 12s No. 6082 - Alloy

Elgin Magistral Super Factory Mainspring for 12s movements, Factory No. 6082, alloy, new in envelope. This a factory alloy version of the steel 1712 and I don't see them very often. See images for 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.