NuVigor Mainspring #598 for NY Standard 0s No. 6133 - Steel

NuVigor Mainspring #598 for 0s New York Standard, Factory No. 6133, steel, new in envelope. See image 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 so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.