Illinois Factory Mainspring for 0s & 3/0s Models No 47359 - Steel

Illinois Factory Mainspring for 0s & 3/0 Model movements, Factory No. 47359, steel, new in frail envelope. One of the beautiful thing about factory mainsprings is that they pretty much always fit. I likely have several of these so the one you get may differ slightly from the images. See images for further details. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.