Newall Security Mainspring #107 for Gruen caliber 845 - Steel

Newall Security steel mainspring No. 107 for Gruen caliber 845 movements and perhaps other wrist watches, 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.