Rolf hasn't changed his appearance......
This is Bill Ramsey - a German jazz/singing artist, and tv/film personality!.
Bill was the face on the German packaging of the Stylophone, and the instruction book. His resemblance to Rolf is obvious to see; albeit without the glasses. Musical connections are also there, and again Bill's involvement with children's tv programmes - among many others - would make him the perfect celebrity to advertise the Stylophone in Germany.
Having visited Bill's website at www.ramsey.de, I can clearly see that he is a very well known personality in that part of the world, so will probably have German/Austrian/Swiss patriots shouting 'you've never heard of Bill?!' at the screen.
The packaging of the German unit mirrors the layout of the British equivalent, with Bill taking Rolf's place, and the 'signature' giving it an air of true recommendation.
There is a slight difference in the design of the logo on the box; noticeably the 'S' and the 'e' in the Stylophone name.
Original logo shown here for comparison