10 Francs postage stamp issue "Provincial Coats of Arms Languedoc", single franking on an overfranked precursor letter, cancelled "QUIBERON 23. 1. 45" to La Baule, Fortress St. Nazaire, censorship stamp Fortress Lorient 18. 01. 1945 with the paraphe "Sch" of the censor officer Dr. Alfons Schmitt. Known error in the Quiberon stamp date, which should be 13. 01. 1945. Local postal service by sea between the two fortresses. Very interesting historical document. Flawless condition. Only 5 letters are known, not signed, an absolute top piece for the collection of occupation issues of World War II. Detailed expertise by Lothar Herbst VP (2023) "The condition is flawless".