30 C. Postage stamps issue "Merkur head" and 70 cent special edition "congress of the american legion in Paris" with overprint in type I, correctly franked mixed franking on cover from Dunkerque 12.7.1940 to Ghyvelde with on the back arrival stamp from 13.07.1940, 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 1.000.-