NuVigor Mainspring #373 for 16s Hampden No. 3696 - Steel

NuVigor Mainspring #373 for Hampden 16s Movements, Factory No. 3696, T end, steel, new in envelope. See images for precise mainspring specifications. 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.