4, 50 Fr. Postal stamp \"Petain\" with inverted overprint \"fortress Lorient\" on paper supports with cancellation through censorship stamp \"fortress Lorient 29. March 1945\" and handwritten signature of the Censorship officer Schmitt, impeccable, issued only 100 pieces - of it only a few with inverted overprint, expertise Lothar Herbst VP (2022) : \"the condition is perfect. Very rare. \"