Hamilton 16s Motor Barrel Factory Mainspring Factory No. 534B - Steel

Hamilton Factory Mainspring for 16s Motor Barrel Movements, Factory No. 534B, steel, new in likely very frail envelope. I likely have several of these so the one you get may differ slightly from the images. See images 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.