HR Mainspring A218 - for 8/0 Hamilton # 7221 - Steel

HR Mainspring A218 for 8/0s Hamilton, Factory No. 7221, T end, steel, new in envelope. See images for precise characteristics. 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 so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.