1913 Liegnitz vignette tied by violet "Flugpost A.D. Katzbach 9.11.13" pmk on "Liegnitz" special ppc, used in combination with 5pf green, "Sachsen" and "Hamburg-Amerika Linie Abtlg. Luftschiffahrt" hs, v.f., cat. €3500 (Cat No. Mi.11) (Image)

Cat. €3500, Est.$1,500

1929 1m Zeppelin, seven copies (three vertical pairs, plus single), n.h., fine-v.f., cat. $560 (Cat No. C35) (Image)

Cat. $560, Est.$200

1930 South American Flight, set of two, h.r., v.f., cat. $500 (Cat No. C38-39) (Image)

Cat. $500, Est.$100

1931 Polar Flight, set of three, l.h., fine-v.f., signed Schlegel, cat. $745 (Cat No. C40-42) (Image)

Cat. $745, Est.$150

1933 Chicago Flight, set of three, h.r., fine-v.f., cat. $950 (Cat No. C43-45) (Image)

Cat. $950, Est.$150

1933 Chicago Flight, 1m carmine, bottom sheet margin single, post office fresh, h.r. in margin only, stamp n.h., v.f., cat. $2700 (Cat No. C43) (Image)

Cat. $2700, Est.$1,000