50 C. Special edition "a hundred years belonging Algeriens to France" with overprint in type I, correctly franked multiple franking on letter from Ghyvelde 21.07.1940 to Dunkirk with on the back arrival stamp from 22.07.1940, faultless condition, expertise Lothar Herbst VP (2019: "the condition is perfect. The stamps are only in very small number of pieces known, therefore are they very rare. Multiple franking with special stamps are very rare. ", Michel 2.100.-