细节
Air Mail cover 1928 (10 Sept.) Trans-Tasman flight Australia to New Zealand experimental flight XU5 (torn and repaired at upper left), carried on the "Southern Cross" and signed on the face by the Pilots C.Kingsford Smith and C.P.Ulm; Christchurch arrival c.d.s. (12.9) and showing transmission to Wellington paid by 1d. meter mark. Very rare, only ten are believed to exist. Photo