June 3, 2026Unlike official airmail stamps, semi-official airmail stamps were issued by aviation companies, air shows, and other aviation-related organizations. The semi-official…
March 28, 2026These semi-official airmails were issued for use on special Zeppelin flights between Liegnitz, Bunzlau, Frankenstein, and Haida, in November 1913.
March 28, 2026This semi-official airmail was issued for use on a special flight between Mühlhausen and Feldberg on 10-12 September 1913. The…
March 28, 2026This semi-official airmail was issued for use on flights operated at Zeppelin Flight Days in Düsseldorf, 20 April 1913.
March 28, 2026These semi-official airmails were issued for use on Regensburg's first airmail flights, which were operated in conjunction with Regensburg Aviation…
March 28, 2026
March 28, 2026