4 Fr. \"marshal Petain\" with hand stamp overprint \"fortress Lorient\", variety \"double overprint, of it one inverted\", properly franked single franking on cover from \"fortress Lorient 3.03.1945\" to Saarbruecken, to a French civil workers arranged, cancelled the franking with the postmark \"Groix\" with Stamp date from 1944, because the post office the new numbers no longer got, handwritten in ink modified in 1945, front- and on the reverse side with censorship stamp and signature \"Sch\" of the Censorship officer Dr. Alphonsus Schmitt, covers to the French civil workers / prisoners of war in Germany were by ship to the fortress St. Nazaire brought and thence per airplane with of the army postal service to Germany transported, the post office advent war 160 letter, of these 96 covers with the postmark \"Groix\" cancelled be should, detailed expertise Lothar Herbst VP (2023) : \"the stamp point at three (mostly very weak) toned perforation on. The other condition is perfect. The edition of the stamp war only 200 piece, of it few in of this variety \"double overprint, of it one inverted\". Covers of the fortress post Lorient are general very rare. Covers to Germany are extreme scarce rarities. \"