Sweden. P.O.W mail, Postcard sent from a German sailor, from the German warship SMS Albatross, who was kept in captivity at Roma, Gotland. Notations “Marine-Feldpost” and “Censureradt”. The censor was made in Wisby. Notation "Prisonniers de Guerre" (or similar) is missing, but was approved unstamped, as neutral Sweden treated detainees as prisoners of war.