D-D Mainspring for Elgin 12s No. 1712 - Steel

D-D Ever-Lasting Mainspring for Elgin 12s Movements, Factory No. 1712, steel, new in envelope. See images 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 suitable job of representing the item.