Hamilton Factory Mainspring for 8/0s Hamilton No. 7221 / 718271 - Steel

Hamilton Factory Mainspring for 8/0s 17j Movements, Catalog No. 7221 / 718271, steel, new in envelope. See images for further details. These were available on a couple of different strengths and those that I can supply can be found in the drop-down list. 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.