1912 (19 Sept) "Hansa" flight via Copenhagen to Harlev, franked with 10o carmine, tied by Copenhagen pmk, with violet on-board cachet, arrival pmk on back, v.f., rare cover, with 1997 Hermann Sieger certificate, cat. €3000 (Cat No. Si.5A) (Image)

Cat. €3000, Est.US$1,200

1929 Orient Flight cover franked with 2m Castle, tied by Friedrichshafen (24 Mar) cds, addressed to Alexandria, Egypt, with arrival pmk, also oval "Mit Luftschiff L.Z. 127 ab Friedrichshafen" and red steel "Orientfahrt" cachet, fine (Image)

Est.US$300

1930 South America Flight, franked with 2x4m, fine-v.f. (Mi.439) cat. €1000 (Cat No. C39) (Image)

Cat. €1000, Est.US$300

1931 Polar Flight, set of three on cover (4m) and two cards, with all appropriate markings, fine-v.f. (Cat No. C40-42) (Image)

Est.US$350