HR Mainspring SA217 for 6/0 Hamilton #2621 / 718203 - Alloy

HR Mainspring SA217 for 6/0s Hamilton, Factory No. 2621 / 718203, T end, alloy, new in envelope. See image for precise mainspring specifications. 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 so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.