50 C. Postal stamp \"peace allegory\" (base stamp type II) with overprint \"Occupied area North France\" in type I, variety \"inverted overprint\", properly franking on cover from \"Ghyvelde 17.07.1940\" to Dunkerque with arrival postmark on the back from 18.07.1940, 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, with inverted overprint very rare. \", Michel 800.-