50 C. Postal stamp \"peace allegory\" with overprint in type I (similar Michel number 2 I respectively 2 II), variety \"inverted overprint\", vertical pair as properly franked multiple franking on cover from \"Ghyvelde 22.07.1940\" to Dunkerque with reverse arrival postmark from \"23.07.1940\", 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. \", Michel 800.-