Newall SUPER Security Mainspring #651 for 18s Hampden No. 1696 - Alloy

Newall SUPER Security Mainspring No. 651 for Hampden 18s Movements, Factory No. 1696, T end, alloy, new in envelope. See images for precise mainspring specifications. 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.