80 C. green postage stamp with inverted overprint "Fort Lorient" on paper backing with cancellation by censorship stamp "Fort Lorient May 1, 1945" and handwritten signature of the censor officer Schmitt, flawless condition, edition of only 300 pieces - of which only a few with inverted overprint, expertise by Lothar Herbst VP (2024) "The condition is impeccable... very rare."