Swartchild Black Shield Mainspring for 12s Hampden No. 6696 - Steel

Swartchild Black Shield Mainspring No. 4349 for Hampden 12s Movements, Factory No. 6696, T end, steel, new in envelope. See images for further details. 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.