In 1938, Jan Zwartendijk (1896-1976) became the representative of a Dutch enterprise “Philips Electronics” in Kaunas, Lithuania. On June 14, 1940 the Dutch Ambassador to the Baltic States, L. P. J. de Decker, who at that time was residing in the city of Riga in Latvia, appointed Jan Zwartendijk as Dutch Honorary Consul in Lithuania. On the following day, the Soviet Union army occupied Lithuania. By the beginning of August 1940, when the Soviets closed the Dutch consulate, Zwartendijk had issued at least 2,345 “Curaçao visas”.
After closing the Riga Embassy, de Decker went to Sweden, where he described the Curaçao scheme to A.M. de Jong, the Dutch consul in Stockholm. Telegrams, letters, and photographs soon began to arrive in Sweden from Lithuania and other Baltic Countries requesting “Curacao visas”. Just like Jan Zwartendijk, de Jong was also well aware that the those documents would not provide entry to Curaçao, but nonetheless mailed some 400 " Curacao visas" in early 1941. Unfortunately, for various reasons including the late date of issue, most of his notations were never used.
During his 34-year-long career in the Dutch Ministry of Foreign Affairs, L.P.J. de Decker worked as a diplomat in Europe, Asia and the Middle East. In 1939 he was appointed as the Dutch Ambassador to the Baltic States and was sent to reside in Riga, Latvia. After the Soviets closed all the foreign consulates, L.P.J. de Decker left for Stockholm, Sweden. L.P.J. de Decker was the one who advised Jan Zwartendijk to issue the fictitious “Curacao visas”.