Zeppelin Flights. April 23-24, 1929, Zeppelin Mediterranean Sea Flight postcard to Vienna, franked by four air post stamps, Friedrichshafen dispatch, red confirmation cachet, Seville ''24.ABR.29'' machine dropped ds on reverse, VF, Mi #20 II, €350 (Image)

Zeppelin Flights. July 12, 1931, Zeppelin Austria Flight cover to Vienna, franked by three adhesives, including ''Airplane and Crane'' stamp of 3s red brown, Friedrichshafen dispatch, blue flight cachet and arrival ds, VF, Sieger #116A (Image)