15 C. And 45 C. Postage stamps issue \"Merkur head\" as well 40 C. Charity issue \"pierre Purvis de Chavannes\" with hand stamp overprint in type I, properly franked mixed franking on letter from \"Dunkerque 11.07.40\" to Ghyvelde with on the back arrival stamp from 12.07.1940, faultless condition, unsigned, 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.-