10 C. Postal stamp "Merkur head and 90 C. Postal stamp "peace allegory" with overprint in type I, correctly franked mixed franking on small-format, charming ladies cover from "Dunkerque 16.07.1940" to Ghyvelde with reverse arrival postmark from "17.07.1940", 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. Especially the Michel-no. 80 (90 C. ) belongs to the extreme rarely postal stamps, the so far only in few pieces are known. ", Michel 1.700.-