50 cent special stamp "a hundred years membership Algeriens to France" with hand stamp overprint in type I, correctly franked multiple franking on letter from Ghyvelde 21.07.1940 to Dunkerque with on the back arrival stamp from 22.07.1940, 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 special stamps are very rare. ", Michel 2.100.-