80 C. Postal stamp emerald green with inverted overprint "fortress Lorient" on paper supports with cancellation through censorship stamp "fortress Lorient 1. May 1945" and handwritten signature of the Censorship officer Schmitt, very fine, issued only 300 pieces - of it only a few with inverted overprint, expertise Lothar Herbst VP (2024) : "the condition is perfect. Very rare. "