1, 50 Fr. charity stamp "Petain" with overprint "fortress Lorient" as correctly franked single franking to the Postrate the 1. post period, on cover from the "fortress Lorient 13. March 1945" to La Baule with arrival postmark on the back "La Baule 19.3 45", actual was the postage to the 01.03.1945 on 2 Fr. increases - due to the war events however unbestandet transported, new photo expertize Lothar autumn VP (2018) : "the condition is perfect. Covers of the fortress post Lorient are general very rare. The charity stamp "Petain" belongs to the greatest rarities, there they only in 20 copies overprinted was. So far are only 7 covers registered. A world rarity! "