30 C. Postage stamps issue \"Aristide Briand\" and 70 cent charity issue \"Births decline\" with hand stamp overprint in type I, properly franked mixed franking on front of cover from \"Dunkerque 04.07.40\" to Ghyvelde, 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 1.200.-