10 C. Postal stamp "Merkur head and 90 C. Postal stamp "peace allegory" with overprint in type I, properly franked mixed franking on small-format ladies letter from "Dunkerque 4.07.1940" to Ghyvelde with arrival postmark on the back from "5.07.1940", 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 800.-