Newall SUPER Security Mainspring #550 for 0s & 3/0s Waltham No. 2230 - Alloy

Newall SUPER Security Mainspring No. 550 for 0s & 3/0s Waltham Model 1907 Movements, Factory No. 2230, alloy, new in envelope. See images for further details and 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 an adequate job of representing the item.