We received letter from Klaus:
please find attached some photos which I took last Monday in Germany. I have no idea which car this is.
Photo was taken on A81 between Heilbronn and Wurzburg. In this Autobahn I have already seen multiple Mercedes, Porsche and Audi Prototypes. The S on the license plate is Stuttgart = Mercedes.
We thank Klaus for upload photo. Together, let us define the model of the car.