Anyone got a clue on what type of horn this is? This comes from an interesting article about the aerophor, a device intended to extend an orchestral wind musician's air capacity. Here it is.
The player is Hofmusiker (= musician of the court) from Schwerin the then capital of Mecklenburg. Mecklenburg now is part of the German state at the Baltic coast, Mecklenburg-Vorpommern. Schwerin still is the capital. The area was part of the GDR.
The title of Hofmusiker dates the photo to before the end of WWI.
The tuba is a sample of Cerveny’s de luxe series of instruments where the link to the rotor crank is mounted under the spatula. This series was discontinued in 1930.