Illinois Factory Mainspring for 0s & 3/0s Movements No. 47357 - Steel

Illinois Factory Mainspring for 0s & 3/0 Model movements, Factory No. 47357, steel, new in envelope. See images for further details. 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. 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.