HR Mainspring SA219 for 8/0 Hamilton No. 7221 / 718271 - Alloy

HR Mainspring SA219 for 8/0s Hamilton, Factory No. 7221 / 718271, T end, alloy, new in envelope. See image for precise characteristics. 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.