Hamilton Factory Mainspring for 16s Motor Barrel Factory No. 718047 - Steel

Hamilton Factory Mainspring for 16s Motor Barrel Movements, Factory No. 718047, steel, new in possibly frail or torn envelope. This is actually just a Factory No. 534 (not a 534B) that Hamilton gave a new number sometime in the 1950's. I likely have several of these so the one you get may differ slightly from the images. See image for precise characteristics. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.