Newall Security Mainspring #818 for NY Standard 10s No. 7080 - Steel

Newall Security Mainspring #818 for 10s New York Standard, Factory No. 7080 , steel, new in envelope. See image for precise mainspring specifications. 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.