10 C. Postal stamp Merkur head and 90 C. Special stamp "castle of the Count from Beaurn in Pau" with hand stamp overprint in type I, correctly franked mixed franking on letter from "Dunkerque 15.07.40" to Ghyvelde with on the back arrival stamp from 16.07.1940, 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 800.-