50 C. Merkur head, horizontal pair from left margin of sheet with overprint \"Occupied area North France\" in type I, properly franked multiple franking on cover from \"Ghyvelde 23.07.1940\" to Dunkerque with arrival postmark on the back from 24.07.1940, faultless condition, expertized Dreyfuss, Roumet, Calves and expertise Lothar Herbst VP (2023) \"the condition is perfect. The stamps are only in small number of pieces known, therefore are they rare. \", Michel 600.-