Illinois Factory Mainspring #47310 for 16s 60hr Railroad Watches - Steel

Illinois Factory Mainspring Factory No. 47310 for 16s 60hr Railroad Model (Bunn) 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.