Illinois 16s Mainspring No. 47317 (573) New Model - Steel

SWISS made mainspring for Illinois 16s New Model, 17j and below, Factory No. 47317 (old #573), steel, new in envelope. See images for further details. These are really nice looking mainsprings. 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. mages do a pretty good job of representing the item.