Marco Mainspring #310 for 16s Hampden Factory No. 4697 - Steel

Marco Mainspring #310 for 16s Hampden Model 1902 Pocket Watches, Factory No. 4697, steel. Could also very well fit in other watches. 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.