HR Mainspring SA223 for Hamilton 14/0s Factory No. 5021 / 718440 - Alloy

HR Mainspring SA223 for Hamilton 14/0s movements such as a 982, Factory No 5021 / 718440, 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 and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.