Hamilton 14/0s Mainspring No. 5021 / 718440 (EXACT) - Alloy

Hamilton EXACT Mainspring for 14/0s Movements, Factory No. 5021 / 718440, alloy, new in envelope. See images for precise mainspring specifications. I likely have quite a few 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.