5 C. And 15 C. Postal stamps "Merkur head and 80 C. Postal stamp "peace allegory" with overprint in type I, correctly franked mixed franking on cover from "Dunkerque 15.07.1940" to Ghyvelde with reverse arrival postmark from "16.07.1940", faultless condition, expertise Lothar Herbst VP (2018) : "the condition is perfect. The stamps are only in very small number of pieces known, therefore are they very rare. ", Michel 1.300.-