30 C. Postal stamp "Merkur head" and 70 C. Special stamps issue "Straßburger cathedral" with overprint in type I, correctly franked mixed franking on letter from "Ghyvelde 29.07.1940" to Dunkirk with reverse arrival postmark from "30.07.1940", 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 750.-