45 C. Postal stamp "Merkur head and 55 C. Postal stamp "peace allegory" with overprint in type I, properly franked mixed franking on small-format, charming ladies letter from "Dunkerque 16.07.1940" to Ghyvelde with reverse arrival postmark from "17.07.1940", very fine, expertized Calves, Dreyfus and Roumet, 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 1.100.-