Illinois Factory Mainspring for 12s movements Factory No. 47342 - Steel

Illinois Factory Mainspring, No. 47342 for 12s movements, steel, new in 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 in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.