This is postmarked in 1942 with a Curacao Stamp.
There are two hand stamps on the back, one is 'Examined by' (6425 is handwritten after that) the other is that it passed the Curacao Censor (this card was sent during World War II)
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Wilhelmina (Wilhelmina Helena Pauline Maria; 31 August 1880 - 28 November 1962) was Queen regnant of the Kingdom of the Netherlands from 1890 to 1948. She ruled the Netherlands for fifty-eight years, longer than any other Dutch monarch. Her reign saw World War I and World War II, the economic crisis of 1933, and the decline of the Netherlands as a major colonial empire. Outside the Netherlands she is primarily remembered for her role in World War II, in which she proved to be a great inspiration to the Dutch resistance.