Illinois Factory Mainspring No. 47353 for 4s & 6s Models - Steel

Illinois Factory Mainspring for 4s & 6s movements, Factory No. 47353, steel, new in likely 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 image. I specialize in hard to find watch parts and all watch parts are guaranteed. Images do a pretty good job of representing the item.