10 C. Postal stamp Merkur head and 90 C. Charity issue "Jean Baptiste Charcot" with hand stamp overprint in type I, properly franked mixed franking on letter from "Dunkerque 03.07.40" to Ghyvelde with on the back arrival stamp from 04.07.1940, faultless condition, unsigned, expertise Lothar Herbst VP (2018) : "the condition is perfect. The stamps are only in very small number of pieces known, therefore are they very rare. ", Michel 1.300.-