Newall Security Mainspring #573 for Waltham Model 670 #2244 - Steel

Newall Security Mainspring #573 for Waltham Model 670 movements, Factory No. 2244, Hole end, steel, new in envelope. See image for further details. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.