Newall Security Mainspring #1233 for Gruen caliber 879 - Steel

Newall security steel mainspring No. 1233 for Gruen caliber 879 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.