80 C. Postage stamps issue \"peace allegory\" and 20 cent postage stamps issue \"Merkur head\" with hand stamp overprint in type I, properly franked mixed franking on letter from \"Dunkerque 16.07.40\" to Ghyvelde with on the back arrival stamp from 17.07.1940, 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 1.000.-