Newall SUPER Security Mainspring #660 for Hampden 6s No. 8696 - Alloy

Newall SUPER Security Mainspring #660 for 6s Hampden, Factory No. 8696, alloy, new in envelope. See images for precise mainspring specification. I likely have several of these so the one you get may differ slightly from the images. 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 a pretty good job of representing the item.