Waleed wrote
Probably Flugsicherungsschiff Richthofen or Hans Albrecht Wedel
Thanks for your answerspb wrote
Yes, a Flugsicherungsschiff, but I'm sorry, I have to disagree with your identification.
In WEDEL and RICHTHOFEN, the crane was further aft. This is one of the quartet MAX STINSKY / KARL MEYER / IMMELMANN / BOELCKE
Regards
Sturm78