Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Netherlands and Colonies - Zeppelin Flights - 1930 (July 16), Northland Flight postcard, franked by four definitive values, tied by Amsterdam ''12.VII.30'' ds, blue confirmation cachet, Bergen July 16 drop and Tromse July 22 arrival markings, VF, Sieger #74