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.-