1 Fr. Charity issue "Auguste Rodin" with hand stamp overprint in type I, variety "inverted overprint", properly franked single franking on letter from "Dunkerque 22.07.40" to Ghyvelde with on the back arrival stamp from 23.07.1940, faultless condition, unsigned, 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 1.500.-