30 C. postal stamp "Merkur head" and 70 C. special stamps issue "Strassburger Muenster" with overprint in type I, properly franked mixed franking on cover from "Dunkerque 8.07.1940" to Ghyvelde with reverse arrival postmark from "9.07.1940", very fine, expertized Roumet, Dreyfus, Tust BPP 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 750.-