The Fokker C.1 two-seat recon-attack aircraft was developed from the seminal Fokker D.VII fighter. Too late to saw action at WW1, these efficient biplanes served as basis, somehow, to Anthony Fokker new start in his own country -Fokker smuggled a number of them, with other types, to Holland just in the nick of time. New built C.1’s and their descendants followed.
Really durable aircrafts, one of them (PH-APL, c/n 527) was equiped in the spring of 1937 with this superb looking propeller, an invention of Adriaan Dekker. According to some sources PH-APL did achieve a sort of short lift off. The Germans took posesion of it in 1940 (when this pic was taken: jackboots) at Holland surrender, after that…. no info.