Thank you Chris for your answer. Your solution seems to be correct. The aircraft are the same in the general outline. The strut scheme for the ones between fuselage and upper wing is matching. But there are also little differences. Your picture does not show that attractive slot/opening scheme in the cowling. In my picture, the edges of the pits for the crew are cut deeper and more rectangularly. In your picture, the wheel holder (correct expression?) is just a rod. If you light up my picture, you will find here it is flat like the one the Bücker Jungmann has. By the way, in my picture the aircraft seems to have different strut schemes between the wings on each other side… But anyway, I am going to store that picture as “DAR 8 Slavei”!
Found a new picture of a rare aircraft…:D Thanks again, Chris!;)

Regards, RT