10 C. Postal stamp "Merkur head" and 90 C. Special stamps issue "world exhibition 1937 in Paris" with overprint in type I, properly franked mixed franking on cover from "Dunkerque 12.07.1940" to Ghyvelde with arrival postmark on the back from "13.07.1940", very fine, expertized Calves, Dreyfus, Roumet and expertise Lothar Herbst VP (2025) "the condition is perfect. The stamps are only in very small number of pieces known, therefore are they very rare. ", Michel 1.000.-