Marco Mainspring #196 for 18/0s Elgin No. 1957 - Steel

Marco Mainspring #196 for 18/0s Elgin 7j to 15 movements, Factory No. 1957, steel, new in envelope. 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.