Christian-Heinrich Mengel comments: This 3 ton cabriolet bus was bodied by Kässbohrer in Ulm. Kässbohrer typically had new vehicles photographed in front of the main entrance of the Ulmer cathedral. Years ago an elder Kässbohrer worker stated that from 1937 - 1939 appr. 20 - 25 3 ton and 15 - 20 1,5 ton chassis were build as cabrios. The where called “Tourenbus” or “Ausflugsbus” (trip or sightseeingbus). Thanks "C.H."! The model probably originated from the picture.