The D.21 or D.XXI was the closest thing to the Spitfire for three minor nations - Finland, Denmark, and Holland - in 1940, when Dutch military aircraft wore orange nationality markings. Serving with the White Mice squadron, the real 221 (c/n 5494), flown by Lt Herman Doppenberg, shot down a Bf 109 over Den Helder on 10 May 1940.