Newall Security Mainspring #1251 for Gruen caliber 100, 101 - Steel

Newall security steel mainspring No. 1251 for Gruen caliber 100, 101 movements and perhaps others as well (620...623, 626), 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.