Colonial COLLOY Mainspring for Hamilton 14/0s 5021 / 718440 - Alloy

Colonial COLLOY Mainspring for 14/0s Hamilton, Factory No. 5021 / 718440, alloy, new in envelope. See images for precise mainspring specifications. 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.