This picture appeared in "Der Flieger " in the 50'
The plane was then entitled "August Klein " 1910
I never found any "August Klein " in my files .
I asked Mr Karlheinz Kens,who has published a lot of excellent books about german aircraft and projects ,and he told me the bird was still a mystery to him.
Who knows more ?
His latest work, "Historische deutsche Flugzeuge bis 1945 is a must !
pics,3 views of Kl106,Kl151,L 20,L21 ,Caspar C32, Gerner G 1,G 2,Bauemer Schnecke ,BV 141 V 2,BV 40,Fw 159 ,Al 101, Ruchtaler Ru 3,and 6 saiplanes of the 20'
On the "Aerodrome" forum , Varese identified it , some times ago : It is the "Hoople Multiplane" built by W.P Gary (1910) in the United States of America ...
How has it been resurrected in the fifties in Germany as "A.Klein" remains a mystery ...