Zeppelin Flights. 1930 (September 10-11), Moscow Return Flight postcard and cover, franked by Zeppelin stamps of 40k dark blue (perf 12½) and 80k carmine (perf 10½) together with definitive stamps, tied by Moscow special ds, two-line confirmation marking in violet, Friedrichshafen ''11.9.30'' receiver, mounted on pages from a Collection, VF, Sieger #85Aa, Bb (Image)

Zeppelin Flights. 1931 (July 25-27), North Pole Flight postcard and cover, franked by Zeppelin Ice-Breaker ''Malygin'' imperforate complete set of four, tied by Leningrad ''25.VII.31'' special ds, each one with red confirmation marking, Ice-Breaker ''27.VII.31'' drop handstamp, arranged on two pages from a Collection, VF, Sieger #120Ba, Bb (Image)

Zeppelin Flights. 1932 (August 29-September 1), 5th SAF cover from Moscow to Bogota, franked by three airship stamps, Friedrichshafen connection, uprated by 3 Colombian adhesives (2 not cancelled), violet confirmation cachet, SCADTA label is alongside, Pernambuco ''1.IX.32'' drop and two arrival markings on reverse, mostly VF, Sieger #171, Est. $500-$600 (Image)