TEMP-RITE Mainspring for Gruen 835, 837, 817SS, 818 - Steel

TEMP-RITE steel mainspring for Gruen caliber 835 - 837 - 817SS - 818 movements and perhaps others, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. 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.