126542 1911 FIRST OFFICIAL U.K. AERIAL POST/LONDON ENVELOPE IN PURPLE-BROWN TO LONDON.

1911 FIRST OFFICIAL U.K. AERIAL POST/LONDON ENVELOPE IN PURPLE-BROWN TO LONDON. A very fine used example of the London envelope in the much scarcer purple-brown colour with KGV 1d Downey addressed to Belsize Park in London and cancelled fine strike FIRST UNITED KINGDOM/AERIAL POST LONDON date stamp SP 13 1911 die 3. With fine original insert. Very clean usage. (Ref 126542).