Marco Mainspring #403 for Hamilton 18s Factory No. 232 - Steel

Marco Mainspring #403 for Hamilton 18s Factory No. 232, Steel, new in likely frail 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 and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.