10 C. And 15 C. Postage stamps issue "Merkur head" as well 75 C. Charity issue "Statue of liberty in New York" with hand stamp overprint in type I, correctly franked mixed franking on first days letter from "Dunkerque 1.07.40" to Ghyvelde with on the back arrival stamp from 2.07.1940, faultless condition, unsigned, 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 1.700.-