In 2019 Jani asked me for advice about this shotgun. Felix had asked Springer in Vienna for information that the shotgun had been delivered to "Kronprinz Prinz Leopold". There was no Austrian Crown Prince Leopold. However, a German one, namely Leopold of Bavaria, came into consideration:

https://de.wikipedia.org/wiki/Leopold_von_Bayern


As I found out today, this one was actually in the colony German Southwest Africa in 1909. Here an article from 2016 in the Allgemeine Zeitung Namibia:

"In May 1909, Colonel General Prince Leopold of Bavaria visited the German colony together with his son Prince Georg. With special permission they go hunting in the Etosha National Park. "Any shooting was prohibited, but an exception was made for the high-ranking visitor, and Governor Bruno von Schuckmann even left the number of pieces to be shot to their liking," General Ludwig von Estorff recalls. He was to be thoroughly mistaken in this, however, and the size of their prey exceeded his worst fears."

It can be assumed that his rifles were registered with the local police authority in Windhoek. The photo shows him (with a light hat) on his arrival in Swakopmund.