NuRezista Mainspring #538 for Elgin 15/0 Factory No. 5550 - Alloy

NuRezista Mainspring #538 for 15/0s Elgin Movements, Factory No. 5550, white 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.