30 C. and 70 C. postal stamps "Merkur head with overprint in type I, properly franked mixed franking on cover from "Ghyvelde 8.07.1940" to Ghyvelde with reverse arrival postmark from "9.07.1940", very fine, signed Pickenpack BPP, 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.-