1911 FIRST OFFICIAL U.K. AERIAL POST/LONDON ENVELOPE TO BELGIUM. Very fine envelope in scarlet from London to Gand (Gent) in Belgium with KGV Downey Heads ½d and 1d x 2 cancelled fine strikes FIRST UNITED KINGDOM/AERIAL POST LONDON date stamp SP 9 1911 die 1. On reverse GENT receiver 12 IX 1911. Very fine. (Ref 102876).