Elgin Factory Mainspring for 20/0s Elgin Grade 905, 906, 907 - Alloy

Elgin Factory Mainspring for 20/0s Elgin Grades 905, 906, 907, alloy, 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 an adequate job of representing the item.