Marco No. 601 Mainspring for 18s E. Howard "N" Model Factory No. 55 - Steel

Marco Mainspring No. 601 for E. Howard 18s "N" "Old Model" movements, Factory No. 55, steel, new in envelope. See image for further details. I likely have several of these so the one you get may differ slightly from the images. I also probably don't need to tell you that these are really difficult to find. 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.