Illinois Factory Mainspring No. 47326 for 16s Railroad Watches - Steel

Illinois Factory Mainspring for 16s Railroad Model Bunn & Sangmamo Motor Barrel movements, Factory No. 47326, steel, new in very 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 very 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.