50 C. stamp "Mercury Head" with overprint "Occupied Territory of Northern France" in Type I, appropriate postage on a local letter from "Dunkerque 1 7 40" (first day) with a rear arrival postmark dated July 2, 1940, flawless condition, examined by H. Krause, Pickenpack BPP and expertise by Lothar Herbst VP (2025) "The condition is impeccable.", Michel 600.-