4 Fr. brick red as a single franking on cover the second postage period (as usual postage exceeding tariff rate, in that case about 2 Fr. ) to La Baule in the fortress St. Nazaire, between the both Atlantic fortresses inventory from January till May 1945 a local established postal service traffic by sea, the existing cover was poste restante mailed and at destination La Baule was the post storage fee of 1 Fr. later calculated (T) and by the red machine cancel receipted, photo expertize autumn VP (2015) : "the cover has on face left slight mould spots and the stamp is in the Perforation area dead easy shaded. Tolerably for a war document from 1945. the other condition is perfect. Covers of the fortress post Lorient are general very rare. The charity stamp louis XIV belongs to the greatest rarities, there they only in 15 copies overprinted was. So far are only 6 covers registered. A world rarity"!