Marco Mainspring #331 for 12s Hampden Pocket Watch No. 6696 - Steel

Marco Mainspring No.331 for 12s Hampden Pocket Watches, Factory No. 6696, steel. Could also fit in other watches as well. 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.