4 decal variants:
1. Fokker D-XXIII, first prototype, June 1939
2. Fokker D-XXIII, first prototype, April 1940
3. Fokker D-XXIII, Netherlands East Indies AF, 1942 /alternate marking/
4. Fokker D-XXIII, captured by the Japanese, 1942 /alternate marking/
Next versions of the D XXIII were also proposed with HS12Xcrs, Jumo 210G and Kestrel XV engines, and although all-metal construction was intended, the prototype was fitted with a wooden wing of greater thickness/chord ratio in order to expedite the test programme. Owing to various problems, including rear engine cooling, only four hours of flight testing had been completed when the invasion of the Netherlands brought the D XXIII development programme to a halt. The proposed armament comprised two 7.9mm and two 13.2mm FN-Browning machine guns.