A.H. Harris Handy Mainspring for Hampden 12s No. 12696 - Steel

Handy Mainspring from A. H. Harris for Hampden 12s movements, Factory No. 12696, steel, new in envelope. See images for further details.  Likely have several of these to 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.