NuTemper Mainspring No. 89 for Gruen caliber 833 - Steel

NuTemper Mainspring No. 89 for Gruen caliber 833 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.