Newall Security Mainspring #659 for Hampden 12s No. 12696 - Steel

Newall Security Mainspring #659 for 12s Hampden, Factory No. 12696, 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.