From René Biber:

Bücker Jungmann HB-RAF, Werk Nr.4, YoM 1936, DoFlug Altenrhein visited England in 1938 sporting this special livery; it was privately owned by Hermann Zollinger of Dübendorf.




Some questions.
  1. What was the purpose of this UK visit ?
  2. Which events were visited, attended ? which airports ?
  3. What is the subsequent fate of HB-RAF? After 1938 the registration HB-RAF as well as the Werk Nr. 4 were never heard of again
  4. Who was this person Hermann Zollinger ?
This photo has been widely published but would anyone have a colour photo ?

Any information would be most welcome. Note that no information could be found in Switzerland, so searches might better take place in the UK

René Biber
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aviation historian/ HB-specialist – since 1956