15 C. And 45 C. Postage stamps issue "Merkur head" and 55 C. Charity issue "Postal Museum in Paris", correctly franked mixed franking on letter from Dunkerque 10.07.1940 to Ghyvelde with on the back arrival stamp from 13.07.1940, 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 1.200.-