NuTemper Mainspring No. 108C for Gruen 290, 291 movements - Steel

NuTemper No. 108C steel mainspring for Gruen caliber 290, 291 movements, and quite likely 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 a pretty good job of representing the item.