Sandsteel Mainspring for Hampden 12s #12696 - Steel

Sandsteel Mainspring for Hampden 12s movements, #12696, steel, new in envelope. This mainspring is made primarily for the Paul Revere and Nathan Hale models. See image for precise specification and 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.