50 C. Charity issue "Musica with new overprinted value plus 20 C. " with overprint in type I, vertical pair with variety "inverted overprint", properly franked multiple franking on cover from Ghyvelde 11.7.1940 to Dunkirk with on the back arrivals cancel from 12.07.1940, very fine, expertized Calves, Dreyfus, Roumet and expertise Lothar Herbst VP (2025) "the condition is perfect. The stamps are only in very small number of pieces known, therefore are they very rare. Multiple franking with charity stamps, to boot with inverted overprint, are extremely rare. ", Michel 1.700.-