NuTemper Mainspring No. 80 for Gruen caliber 830, 831 - Steel

NuTemper Mainspring No. 80 for Gruen caliber 830, 831 movements and perhaps others, steel, 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 an adequate job of representing the item.