PM Mainspring M223 for 14/0s Hamilton No. 5021 / 718440 - Alloy

PM Mainspring M223 for 14/0s Movements, Factory No. 5021 / 718440, alloy, new in envelope. See images for further details and note it's shown as equivalent to a HR SA223. 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.