HR Mainspring SA205 for 16s Hamilton Factory No. 318 / 718043 - Alloy

HR Mainspring SA205 for Hamilton 16s Movements, Factory No. 318 / 718043, alloy, new in envelope. See images for precise mainspring specifications. 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 a pretty good job of representing the item.