Newall Security Mainspring #407 for 18s Elgin Factory No. 1956 - Steel

Newall Security Mainspring #407 for Elgin 18s Veritas, Factory No. 1956, steel, new in frail envelope. See images for precise mainspring specifications. 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.