10 C. Merkur head and 90 C. Special edition \"castle of the Count from Bearn in Pau\" with overprint in type I, properly franking on cover from \"Dunkerque 17.07.1940\" to Ghyvelde with arrival cancel from 18.07.1940, faultless condition, expertized Pickenpack and expertise Lothar Herbst VP (2023) : \"the condition is perfect. The stamps are only in very small number of pieces known, therefore are they very rare. \", Michel 800.-