1911 FIRST OFFICIAL U.K. AERIAL POST/LONDON EMERGENCY ENVELOPE IN RED-BROWN TO FRANCE/MIXED REIGNS USAGE. A fine to very fine London emergency envelope in red-brown to Bigorre, France with attractive combination of King Edward VII 1½d (corner fault) and KGV 1d Downey scarlet each cancelled fine to very fine strikes FIRST UNITED KINGDOM/AERIAL POST LONDON date stamp SP 15 1911 die 1. On reverse BIGORRE PYRENEES receiver 27-9 11. Attractive usage. (Ref 104403).