1930 (17 Jan) special flight from the Peace Conference in the Hague to Danzig, two covers, one Registered, each with oval "Consulate der Nederlanden te Danzig" handstamp, fine-v.f., one with Berlin transit and Danzig arrival pmk, only 25 pieces flown, of which 10 were registered (Image)

Est.$250

1931 (13 July) first flight cover (Inapress imprint on backflap) from Amsterdam, via Berlin to Peking, China, with appropriate transit and arrival pmks, fine (Image)

Est.$150