National Unbreakable Mainspring for Elgin Grade 700 No. 6693 - Alloy

National Unbreakable Mainspring for Elgin Grade 700 Movements, Factory No. 6693, alloy, new in envelope. See image for further details. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.