NuREZISTA Mainspring #501 for 18s Elgin Factory No. 812 - Steel

NuREZISTA Mainspring No.501 for 18s Elgin, Factory No. 812, DB&H end, steel, new in damaged envelope. See images for further details. I likely have several of these so the one you get my 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.