1915 - 1916, three cards from sailors by airship multiples, in detail letter cancel "airship band No 12" from Brüssel 19.7.15, "of Wuerttemberg airship band no. 12" from Namur 20.4.16 and single circle postmark "weather station of the Air ship harbor Legnica" from Legnica 19.6.16, all superb