NuVigor Mainspring #656 for Crown (NY Standard) 12s No. 1322 - Steel

NuVigor Mainspring #656 for 12s Crown, made by New York Standard, Factory No. 1322, steel, new in envelope. See images for precise mainspring specifications. Not an easy mainspring to find. I specialize in 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.