Nivaflex Unbreakable Mainspring for Gruen 290, 291, 295 - Alloy

Nivaflex Unbreakable mainspring N1213 for Gruen caliber 290, 291 & 295 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.