NuTemper Mainspring No. 263 for AS 1194, ETA 810 caliber movements - Steel

NuTemper No. 263 steel mainspring for AS caliber 1194 & ETA caliber 810 movements, and quite likely others as well, 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.