50 C. postage stamp "Allegory of Peace" (Urmarkentype II) with overprint "Occupied Territory Northern France" in Type I, variety "inverted overprint", proper franking on a letter from "Dunkerque 8. 07. 1940" to Arneke with reverse arrival stamp from 8. 07. 1940, flawless condition, signed Fourcoult, Calves and expertise Lothar Herbst VP (2025) "The condition is flawless. The stamps are known in very small quantities, therefore they are rare.", Michel 800.-