Germany 1931, Polar Flight, Mi.457, 2M blue, tied by "on board" 24.7.31 cds, Leningrad 25.VII.31 receiver alongside, on imprinted Air Mail cover from H.E.Sieger, addressed to Lobenstein/Thüringen 28.7.31 pmk,. very fine (Sieger 119B)

Germany 1931, Polar Flight, Mi,457 tied by "on board" 25.7.31 cds, "Malyguin" 27-VII-31 receiver alongside, usual flight cachet, framed red "Flugpost"-cachet and etiquette on real photo card of the Zeppelin in Flight, very fine (Sieger 119C)

Germany 1931, Polar Flight, 456(2) on picture postcard, tied by "on board" 25.7.1931 cds, "Malyguin" arrival 27-VII-31 alongside, usual flight cachet and arrival pmk. Rowayton (Connecticut), very fine (Sieger 119C)

Germany 1931, Polar Flight, Mi.457, tied by Friedrichshafen 24.7.31 cds, "Icebreaker Malyguin" 27-VII-31 receiver alongside, usual flight cachet, very fine (Sieger 119C)

Germany 1931, Polar Flight, Mi.456(2) on picture postcard, tied by Friedrichshafen 24.7.31 cds, "Icebreaker Malyguin" 27-VII-31 receiver alongside, usual flight cachet, corner bend lower left, very fine (Sieger 119F)

Germany 1931, Polar Flight, Mi.457 and US 5 cents violet on home made postcard, tied by Friedrichshafen 24.7.31 cds, "Malyguin" arrival cancel alongside, usual flight cachet, to be forwarded via Alaska to Seattle, very fine (Sieger 119F)

Germany 1931, Polar Flight, Friedrichshafen to Icebreaker "Malyguin", Mi.458 tied by Friedrichshafen 24.7.31 cds, Icebreaker "Malyguin" 27-VII-31 receiver alongside, usual flight cachet on imprinted Air Mail cover, backstamped "First Intourist Expedition 1931 Icebreaker Malyguin" (Sieger 119F)

Germany 1931, Polar Flight Berlin to Leningrad, Mi.456 in vertical pair, tied by Berlin-Staaken 25.7.31 cds, Leningrad arrival 25.VII.31 alongside, usual flight cachet, very fine (Sieger 119G)

Germany 1931, Polar Flight Berlin to Leningrad, Mi.457, tied by Berlin 25.7.31 cds, Leningrad arrival 25.VII.31 alongside, usual flight cachet, on the backside sealed by Tuberculose stamp, very fine (Sieger 119G)

Germany 1931, Polar Flight Berlin to Kansas USA, Mi.458, tied by Berlin 25.7.31 cds, arrival "Malyguin" 27.VII.31 alongside, usual flight cachet, backstamped Paola-Kansas Sep 6, very fine (Sieger 119H)

Germany 1931, Polar Flight Berlin to Lakewood USA, Mi.458, tied by Berlin-Staaken 25.7.31 cds, arrival "Malyguin" 27.VII.31 alongside, usual flight cachet and typed: "Berlin drop mail to Franz Josephs Land", corner bend, very fine (Sieger 119H)

Germany 1931, First South America Flight 1931, Mi.457, tied by Berlin 29.8.31 cds, green flight cachet, special red connecting flight cachet on original Zeppelin photocard to Rio de Janeiro, arr. pmk. 3.IX.31, very fine (Sieger 124Dc)

Germany 1932, Fourth South America Flight Duisburg 30.4.32 cds to Friedrichshafen 2.5.32 cds to Buenos Aires May-7-32 (backstamped) with colourfull franking (RM4,75) with f.i. Mi.457 and the usual flight cachet, very fine (Sieger 157A)

Danzig 1932, Luposta Flight, Mi.231/35 on Roundtrip to Rönne 31.7.32, one-liner "Abwurf Rönne", to Copenhagen (Sieger 170Aa)

Danzig 1932, Returnflight Luposta - Friedrichshafen 1-8-32, usual flight cachet, very fine (Sieger 170B)

Germany 1933, Century of Progress Flight Friedrichshafen - Akron, Chicagofahrt Mi.497 and 527, tied by "on board" 16.10.33 cds, usual flight cachet, backstamped Akron Oct 25, very fine (Sieger 238Bb)