50 cent charity issue "Musica" with hand stamp overprint in type I, correctly franked multiple franking on cover from Ghyvelde 7.07.1940 to Dunkerque with on the back arrival stamp from 8.07.1940, expertise Lothar Herbst VP (2018) : "the condition is perfect. The stamps are general only in very small number of pieces known, therefore are they very rare. Multiple franking with charity stamps are very rare. ", Michel 1.400.-