1 Fr. Charity issue \"marshal F. Foch\" with overprint in type I, properly franked single franking on cover from \"Ghyvelde 8.07.1940\" to Dunkirk with reverse arrival postmark from \"9.07.1940\", faultless preservation, expertise Lothar Herbst VP (2018) : \"the preservation is perfect. The stamps are only in very small number of pieces known, therefore are they very rare. \", Michel 1.000.-