1911 FIRST OFFICIAL U.K. AERIAL POST/LONDON ENVELOPE IN BRIGHT GREEN. Example of the London envelope in bright green, faults at top and on reverse, addressed to Hampstead London with KGV 1d Downey cancelled good strike FIRST UNITED KINGDOM/AERIAL POST LONDON date stamp SP 9 1911 with the scarcer die 5. This die is much scarcer as it was used at Hendon Airport on mail collected locally and from two stores. Insert with written message accompanies. Normal retail £85. (Ref 119456).