Airmail envelope, Sydney-London, 'BOAC Britannia / First Flight Between London and Sydney', paper, made by BOAC, London, England, 1957
Philatelic envelope commemorating the first flight between London and Sydney with an Australian stamp in the upper right corner. The design on the left side of the envelope depicts the propellers of a turbo-prop Britannia aircraft and a flight path between Britain and Australia. The stamp shows the skyline of Melbourne and the Yarra River. The envelope is addressed to the General Manager of BOAC in London. The postmark is from GPO Sydney and dated 5 March 1957. On the back of the envelope is a postrmark from London, dated 11 March 1957.
Postmark on front of envelope, stamped in black ink 'G.P.O. SYDNEY 148 / N.S.W AUST / 4-P-5MR57'
Postmark on back of envelope, stamped in purple ink 'BOAC POST (illeg.) WAYS TERMINAL S.W.1 / RECEIVED / 11 MAR 57 / (Roman numeral clock face)'