Newall SUPER Security Mainspring #601 for 18s Hamilton No. 15 / 718013 - Alloy

Newall SUPER Security Mainspring #601 for Hamilton 18s Movements, Factory No. 15 / 718013, alloy, new in envelope. See images for precise mainspring specifications. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.