Sandsteel Mainspring for 16s Elgin No. 4931 - Steel

Sandsteel Mainspring for Elgin 16s 23j Motor Barrel movements, Factory No. 4931, steel, new frail envelope. See images for precise mainspring specifications. 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.