1911 FIRST OFFICIAL U.K. AERIAL POST/LONDON ENVELOPE IN BRIGHT GREEN TO SWITZERLAND. Fine London envelope in bright green addressed to Schonenwerd, Switzerland with attractive combination of KGV Downey ½d and 1d x 2, each cancelled fine strike FIRST UNITED KINGDOM/AERIAL POST LONDON date stamp SP 11 1911 die 1. On reverse SCHONENWERD receiver 18.IX.11. Very fine overseas usage. (Ref 104433).
