Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Danzig - 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, Sc. # C26, C28, C30