NuRezista Mainspring #502 for 18s Elgin Factory No. 812 - Alloy

NuRezista Mainspring #502 for Elgin 18s, Factory No. 812, alloy, new in envelope. See images for precise mainspring specifications. 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.