50 cent. Charity issue "Nansen-Fonds" with overprint in type I, correctly franked multiple franking on cover from Ghyvelde 16.7.1940 to Dunkerque with on the back arrival stamp 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. ", Michel 1.500.-