10 C. Mercury head and 90 C. special issue "Castle of the Count of Bearn in Pau" with overprint in Type I, proper postage on a letter from "Dunkerque 24. 07. 1940" to Ghyvelde with arrival postmark dated 25. 07. 1940, flawless condition, examined by Pierre Mayer, Krischke and expertise by Lothar Herbst VP (2025) "The condition is impeccable. The stamps are known in very small quantities, therefore they are very rare.", Michel 800.-