First Period, 1908 To 1914
The first zeppelin to carry mail was LZ 4, in July 1908, followed shortly by LZ 3. The early flights did not use any special markings; the first was an oval reading "LUFTSCHIFF / SIGNALPOST" around the edge and "Z III" in the center, used on LZ 6 (Z 3) from August to October 1909. By 1911 a number of different postmarks were in use; a typical example was a circle reading "AN BORD DES / ZEPPELIN / LUFTSCHIFFES", with a date in the center and the name of the zeppelin at bottom. These were actually applied on board the zeppelin while in flight, at a small postal station.
The zeppelins were taken into military service in 1914, and thereafter did not carry civilian mail, although military commanders had special handstamps applied to their mail.
Read more about this topic: Zeppelin Mail