1911 FIRST OFFICAL U.K. AERIAL POST WINDSOR PRIVILEGE ENVELOPE IN VIOLET TO HENDON. A very fine used example of the Windsor privilege envelope in violet with typed address to ' The Central London Sick Hospital, Collindale Avenue, Hendon' with KGV 1d Downey tied fine strike 'FIRST UNITED KINGDOM/AERIAL POST WINDSOR' date stamp SP 16 1911 Die 2. With orginal insert. This hospital was the one where Hubert, the pilot who crashed during this event was cared for. Very fine and rare. (Ref 141488).
