Newall SUPER Security Mainspring #502 for 18s Waltham No. 2206 - Alloy

Newall SUPER Security Mainspring #502 for 18s Waltham, Factory number 2206, T end, alloy, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ very slightly from the images. 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.