Welcome to Watchuseek and welcome to the German Watches Forum as well.
I moved your post from Reviews to this forum.
Attached you will find a pic of the GUB 11-26.
According to former members the Kampfschwimmer have been supplied with several types of watches. First huge Russian diver watches, then [if the funds were sufficient] Glashütte Spezichron diver´s watches and then in the later 80s the Ruhlas.
