50 cent. Charity issue \"unemployed children\" with overprint in type I, properly franked multiple franking on letter from Ghyvelde 7.7.1940 to Dunkerque with on the back arrival stamp from 8.07.1940, faultless preservation, expertise Lothar Herbst VP (2018) : \"the preservation is perfect. The stamps are only in very small number of pieces known, therefore are they very rare. Multiple franking with charity stamps are very rare. \", Michel 1.200.-