Marco Mainspring #430 for Hamilton 12s Factory No. 1228 - Steel

Marco Mainspring #430 for Hamilton 12s, Factory No. 1228, steel, 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 and regardless of how it may look, all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.