Illinois Factory Mainspring No. 47344 for 12s movements - Steel

Illinois Factory Mainspring No. 47344 for 12s movements, steel, new in likely 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. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a satisfactory job of representing the item.