10 C and 15 C. Postage stamps issue "Merkur head" and 75 C. Postage stamps issue "Paul Doumer" with overprint in type I, properly franked multiple franking on small-format ladies letter from Dunkerque 4.7.1940 to Ghyvelde with on the back arrival stamp from 5.07.1940, faultless condition, expertise Lothar Herbst VP (2019) : "the condition is perfect. The stamps are only in very small number of pieces known, therefore are they very rare. ", Michel 2.000.-