Hamilton Factory Mainspring for 16s Factory No. 718049 (534B) - Steel

Hamilton Factory Mainspring for 16s Movements, Factory No. 718049 (534B), steel, new in frail envelope. See images for mainspring specifications. This is a tough number / strength to find so grab them when you can. 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 an adequate job of representing the item.