HR Mainspring SA124 for Elgin 10/0s Factory No. 1957 / 6009 - Alloy

HR Mainspring SA124 for 10/0s Elgin, Factory No. 1957 / 6009, alloy, new in envelope. See images for precise specifications. 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.