Reinhard Mey is correct.
Wilhelmshafen is then probably also correct as Reinhard did his first solo flight from there and his Tie has been clipped.
Now I need to confess that I do not have the final answer myself on the aircraft.
I have checked the suggestions but up to now I have not found a dashboard that is roughly the same.
The divided dash upper/lower can be found on both suggested makes.
But I have not found pictures of dashboards of which the lower half has an arched extension (downwards) in the middle.
Further clues to search could perhaps be:
The Ball shaped choke/lever on a pin (see shadow)
or the type plate in view in center of the left seat?
So who can help me (us) further on this?