CR Mainspring for Hampden 16s Factory No. 4697 - Steel

Charles Robert Mainspring for Duber Hampden 16s Movements, Factory No. 4697, steel, new in replacement envelope. See images for further details. 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 and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.