25 C. definitive series "Mercury Head" in a mixed franking with a 75 C. definitive issue "Paul Doumer" with overprint in Type I, proper postage on a letter from Ghyvelde 21 7 40 to Dunkirk with a reverse arrival stamp dated July 22, 1940, flawless condition, certified by Calves, Dreyfus, Roumet and expertise by Lothar Herbst VP "The condition is flawless. The stamps are known in very small quantities, therefore they are very rare.", Michel 1. 700.- - we can offer this franking combination for the first time!