Argentina: 1930 Zeppelin Round World Flight, Argentine mail registered cover (some tones), franked Zeppelin blue opt set 20c-3P60, plus green opt 90c, tied by 'Aeropostal Argentina 21 MAY 30' cds. To Germany with flight cachet & Friedrichshafen b/s. SG 582-86 & 589 cat £170+ as loose stamps alone. Sieger 63D(a) cat €650 for blue set on cover, plus the 90c green opt. (P) (Image1)

Estimate AU$1,000

Argentina: 1930 Zeppelin Round World Flight, Argentine mail cover franked Zeppelin green opt full set 20c-1P80, tied by 'Aeropostal Argentina 21 MAY 30' cds. To Germany with flight cachet, Friedrichshafen b/s. SG 587-91 cat £600+ as loose stamps. Sieger 63G9a) cat €3300. Extremely rare franking combination 2002 Eichele photo-cert. (P) (Image1)

Estimate AU$3,000

Bolivia: 1930 Zeppelin Round World Flight Bolivian mail cover (horiz centre fold), franked 'Z' opt Zeppelin set 1B50/15c, 3B/20c & 6B/35c, plus opt Airmail set 5c/10c - 1B, all non-metallic inks, tied by 'La Paz 14 Mayo 30' airmail cds. To England with Round World cachet, boxed Graf Zeppelin cachet & script 2-line cachet, Friedrichshafen b/s. SG 228-35 & 241-43 cat £525+ as loose stamps alone. Sieger 60D cat €1800. Extremely rare franking combination. (P) (Image1)

Estimate AU$1,800

Danzig: 1932 Zeppelin Round Flight Registered cover franked Airpost Exhib opt set 10pf/1G - 30pf/10G, plus 20pf & 1G Airs, tied by 'Exhib 23 7 32' cds & with green Ruckfahrt cachet. To Perth with b/s of Danzig, Friedrichshafen & Perth. Sieger 170B cat €180. Stamps Mi 231-35 cat €148+, SG 221-25 cat £170+, both as loose stamps alone, plus premium for rare usage to Australia. (P) (Image1)

Estimate AU$400

Germany: 1929 Zeppelin German flight cover franked Eagle 15pf tied by 'Hamburg 17 9 29' cds, with On Board red cds. Sieger 34m cat €300. (Image1)

Estimate AU$325

Morocco Agencies: 1934 Zeppelin 4th South America flight cover franked opt KGV 1/- & 3d, tied by 'British PO Tangier 16 JY 34' PMK. To Brazil with Air cachet code 'C', Pernambuco arrival b/s. Sieger 260 cat €275. (P) (Image1)

Estimate AU$700

Morocco Agencies - Tangier: 1934 Zeppelin 10th South America flight card franked KGV opts ½d-3d horiz strip of 3, tied by 'British PO Tangier 6 OC 34' cds. To Brazil with Air cachet code 'C', Stuttgart b/s & Pernambuco arrival. Sieger 280 cat €350. (P) (Image1)

Estimate AU$600

Netherlands Indies: 1936 Zeppelin Hindenburg Olympic flight cover (centre fold) franked Queen 25c & 50c, plus Air 30c, tied by 'Semarang 24 7 36' cds. To Berlin with transit b/s, Flight cachet & returned to Semerang. Sieger 427 cat €450. (P) (Image1)

Estimate AU$600

Netherlands Indies: 1936 Zeppelin 7th North America flight cover franked Def Queen 15c & 1G, tied by 'Soengei Gerong 7 8 36' cds. By Airship to Nth America & by airmail from New York, with flight cachet, b/s Flughafen Halle/Leipzig 13 8 36. Sieger 430 cat €400. (P) (Image1)

Estimate AU$900

Tunisia: 1934 Zeppelin 4th South America flight card franked 5 stamps inc 10Fr black, tied by Tunis cds. To Brazil with Airmail cachet type 'C', Pernambuco arrival b/s. Sieger 260 cat €350. (P) (Image1)

Estimate AU$700

USA & Australia: 1936 Zeppelin Hindenburg Trans-Atlantic flight cover that was apparently only sent on a short flight franked Def $1, Air 10c & Special Delivery tied by 'New York May 11 36' pmk to New York with '(Morgan Annex)' return cds. Then sent under cover to Brisbane where franked Kookaburra 6d to go to Philippines where franked US Airmail 25c (3) tied 'Manila JUN 15' duplex pmks for return to USA where it finally arrived 12 July. Cachets inc 'Fee Claimed by Office of First Address' & 'Offered at Address - Cause of non-delivery', plus numerous b/s. (P) (Image1)

Estimate AU$1,500

Yugoslavia: 1932 Zeppelin 9th South America flight card, franked King 20D & 1D50 tied by triangular 'Zagreb 16 X 32' blue pmks, To Brazil with flight cachets, 2 Brazil b/s. Sieger 195 cat €300. (P) (Image1)

Estimate AU$600