Zeppelin Flights. 1931 (June 10), Vaduz-Lausanne Flight, Zeppelin stamp of 1fr olive black on Swiss stationery postcard 10c dark green, Lausanne ''10.VI.31'' cancellation, Vaduz red Flight marking and same day arrival ds, VF, Sieger #110 var, Est. $150-$200 (Image)

Zeppelin Flights. 1933 (July 18), Switzerland Flight postcard to Luzerne, franked by Airplane over Rhine valley 1fr lake, cancelled by Triesenberg ''15.VII.33'' ds, green Flight marking, Bern drop and Luzerne ''18.VII.33'' receiver, mostly VF, Sieger#222, Est. $100-$150 (Image)