b'49124124C 7 Feb.1928 (AAMC.116) England - Australia cover front carried by Bert Hinkler on his record-breaking solo flight for delivery to EJ Hart, editor of the Australian Aircraft journal, originally sent to the Royal Aero Club, London with Great Britain KGV 1d red and d green tied HAMPSTEAD SO NW3/4JA/28, after arrival in Australia Hinkler signed and endorsed the cover Per Avro Avian G-EBVO/carried from London to Melbourne/by B Hinkler and drew a sketch map of the route below this, front only mounted on card, Cat $8,000. Ex Frommer, sold for $7200 in the September 2016 sale of his Grand Prix Pioneer Australian Air Mails Collection.Accompanied by 1932 explanatory letter from Air Mail Consultant Francis Field stating only cover known, although Newall and AAMC now record three letters carried. $6,0007,500'