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 letter from Dunkerque 19.7.1940 to Ghyvelde with on the back arrival stamp from 20.07.1940, 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.-