15 C. And 45 C. Postage stamps issue "Merkur head" and 55 C. Special edition "Jean Jaures", correctly franked mixed franking on cover from Dunkerque 14.07.1940 to Ghyvelde with on the back arrival stamp from 15.07.1940, in perfect condition, expertise Lothar Herbst VP (2018) : "the condition is perfect. The stamps are only in very small number of pieces known, therefore are they very rare. ", Michel 1.400.-