Permotone Unbreakable Mainspring No. 123 for Gruen 115, 117, 119, 123 - Alloy

Rezista Permotone Mainspring No. 123 for Gruen caliber 115, 117, 119, 123 plus perhaps other similar ébauche movements as well, 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.