80 C. charity stamp "Hardouin-Mansart" in mixed franking with 10 C. postal stamp (2) and 1 Fr. postal stamp as correctly franked on cover the 2. postage period from 9. March 1945 to La Baule in the fortress St. Nazaire with arrival stamp from 19.3.1945, photo expertize Lothar autumn VP (2018) : "stamp margins and cover are partial slightly gum spots, at the Michel no. 17 indeed it is only tiny thus entirely insignificant. Michel no. 1 (left stamp) has left a vertical paper inverted pleat. The cover is lower left a little improper opened. The other condition is perfect. The Michel-no. 8 has only a small printing from 150 piece, the printing the Michel-no. 1 amounts to only 650 piece. Covers of the fortress post Lorient are general very rare. The charity stamp "Hardouin-Mansart" belongs to the greatest rarities, there only 15 pieces overprinted were. So far are only 5 covers registered. A world rarity!