Nivaflex Mainspring for Gruen 400, 405, 410, 420, 425, 430, 440, 500 - Alloy

Nivaflex mainspring for Gruen caliber 405, 410, 411 plus perhaps several other similar ébauche movements, white 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.