Sandsteel Mainspring for 12s Hampden Factory No. 6696 - Steel

Sandsteel Mainspring for 12s Hampden movements, Factory No. 6696, steel, new in envelope. Could also very well fit in other movements. 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.