Illinois Factory Mainspring No. 47343 for 12s movements - Steel

Illinois Factory Mainspring No. 47343 for 12s movements, steel, new in possibly frail or torn 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. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.