And I do mean a SB-2 and not a Czech Avia B-71.
This is a heavily modified (see nose section) Russian SB-2.
Many Czech B-71's entered German service, but no photo of a Russian SB-2 in German markings was ever shown.
Well, here is one.
At first it looked like an Ar-2, but it is actually a SB-2 variant.
For the Dutch: Ik hoef dit toch niet te vertalen ?!
Jan