9 Sep. 1911 1d KGV tied for first day usage of the deep dull green envelope (with insert) carried on the inaugural British air mail service with special cancel, addressed to Sydney. Two examples recorded in this colour to Australia. (Image)

Estimate AU$200-300
Min. Bid. AU$160

12 & 19 Sep. 1911 fourth and fifth day usages of the purple-brown postcards carried via the inaugural British air mail service, and addressed to Sydney and Melbourne respectively; the latter paid at ½d internal rate only and accordingly taxed 1d upon arrival. (2) (Image)

Estimate AU$200-300
Min. Bid. AU$160

14 Sep.1911 sixth day usage of the purple-brown postcard with Organizing Committee printed inscription on reverse for inaugural British air mail service; addressed to Cessnock, N.S.W.. The only recorded example of this special printing to Australia. (Image)

Estimate AU$200-300
Min. Bid. AU$160

15 Mar. 1926 flight cover with typed endorsements 'ROUND TRIP', 'LONDON TO CAPE TOWN./BY AIR FROM CAPE TOWN TO LONDON' and 'ALAN J. COBHAM'S DEMONSTATION FLIGHT', boldly signed "Alan J. Cobham", posted on arrival following the return flight from Cape Town to London with GB KGV 1½d tied by LONDON W.C./MAR 15/1926' machine cancel. Approximately 18 covers were carried on the return flight.   (Image)

Estimate AU$600-800
Min. Bid. AU$460