10 C. Postage stamps issue "Merkur head" and 90 C. Charity issue "L. Trulin" with hand stamp overprint in type I, properly franked mixed franking on front of cover with first day postmark from "Dunkerque 1.07.40" very fine, expertized Dreyfus, Roumet, 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 600.-