Colonial COLLOY Mainspring for Hamilton 16s 317 - Alloy

Colonial COLLOY Mainspring for 16s Hamilton, Factory No. 317, alloy, new in envelope. See images for further details. 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.