Illinois Factory Mainspring No. 47334 for 16s movements - Steel

Illinois Factory Mainspring Factory No. 47334 for 14s & 16s movements, steel, new in frail envelope. One of the beautiful thing about factory mainsprings is that they pretty much always fit. 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 an adequate job of representing the item.