Nivaflex Mainspring for Gruen 210, 211, 212 - Alloy

Nivaflex mainspring No 109 for Gruen caliber 210, 211 & 212 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.