Marco Mainspring #390 for 11/0s Hampden Movements No. 11696 - Steel

Marco Mainspring No.390 for 11/0s Hampden Wrist Watch movements, Factory No. 11696, steel, new in envelope Could also very well fit in other small American wrist watches too. 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.