HUB Mainspring for Hampden 6s Factory No. 8696 - Steel

M. Myers HUB Mainspring for Hampden 6s movements, old #253, newer number #8696, steel, new in frail envelope. See image for further details. Given these are probably almost 90 years old I did inspect them pretty carefully and they're ready to use. 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.