10 C. Postage stamps issue \"Merkur head\" and 90 C. Charity issue \"23. Anniversary of the triumph by Verdun\" with hand stamp overprint in type I, properly franked mixed franking on letter from \"Dunkerque 13.07.40\" to Ghyvelde with on the back arrival stamp from 14.07.1940, faultless preservation, unsigned, 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 700.-