Marco Marshalloy Mainspring #479 for Hamilton 8/0s No. 7221 / 718271 - Alloy

Marco Marshalloy Mainspring #479 for Hamilton 8/0s Movements No. 7221 / 718271, 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 is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.