45 C. Postage stamps issue "Merkur head" and 55 C. Special edition "Jean de la Fontaine" with hand stamp overprint in type I, properly franked mixed franking on front of cover with cancellation from "Dunkerque 11.07.40", expertized Dreyfus, Roumet and expertise Lothar Herbst VP (2025) "the condition is perfect. The stamps are only in very small number of pieces known, therefore are they very rare. ", Michel 700.-