Nivaflex Mainspring for Gruen 460, 470, 475, AS 1320, 1323 - Alloy

Nivaflex Mainspring for Gruen 460, 470, 475, AS 1320, 1323, plus perhaps similar ébauche watches, white alloy, new in envelope.  See images for further details.  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.