Congratulation Varese ,you have got it .
The caption says :
August Birkmaier's (born on 7/8/1887 in Ebersberg ,Fluglizenz Nr 117 on 20/9/1911) last flight on the 4/10/1912 at Hannover .
HAMMER & KROLLMANN Eindecker .
For HAMMER ,Lange writes "Fritz Hammer" a well known pilot before ,during ,and after the War (in South America)
But there was an "Otto Hammer" too who built four planes in Hannover,the last of them being an "Harlan-Typ".
Difficult to say whether two men named HAMMER built in the same times two different "Harlan-like" monoplanes in Hannover ,or a Lange's mistake for the forename .
The scoreboard at the end of Challenge #146:
-----HAMMER & KROLLMANN Eindecker 1912----
24.60 Rbailey
19.20 Varese2002
18.80 aerohydro
14.20 Aquilius
9.50 richard B
9.20 Rod_Filan
7.30 matte_kudasai
6.00 Cruze
6.00 Flamingo
6.00 YavorD
5.50 Airarticles
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3.50 Lodzermensch
3.30 berman
3.00 joegertler
3.00 sobrien
2.00 Doc
2.00 sodium
1.40 Wind In The Wires
1.10 Froggy
1.00 paolomiana
0.20 Willi Von Klugermann
0.20 EricGoedkoop