Zeppelin Flights. 1930 (July 9-10), Spitsbergen Flight pre-printed cover from Danzig to Hammerfest (Norway), franked by three Air Post values, green Flight cachet, arrival ds on reverse, mostly VF, Sieger #73, €450, Est. $250-$300 (Image)

Zeppelin Flights. 1932 (July 31 - August 1), Danzig (Luposta) Return Flight postcard to Germany, franked by complete surcharged air post set of five, green Flight marking, Friedrichshafen machine ''1.8.32'' arrival is alongside, VF, Sieger #170B, €160 without a premium for franking, Est. $100-$150 (Image)