NuRezista Mainspring #504 for 18s Elgin Factory No. 1956 - Alloy

NuRezista Mainspring No. 504 for Elgin 18s, Factory No. 1956, alloy, single-brace end, 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.