Newall SUPER Security Mainspring #629 for Hamilton 22/0s #6221 / 718601 - Alloy

Newall SUPER Security Mainspring #629 for Hamilton 22/0s movements, Factory No. 6221 / 718601, 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 in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.