Coronation Flight 1911, First UK Aerial Post by sanction of H.M. Postmaster General, First Flight Windsor - London effected on 09-17, printed cover (green-olive) franked with 1 Penny red and cancelled with special aerial postmark Windsor 09-16 addressed to West Ham, arrival cachet 09-18, certified Bolaffi
6; Flugpost; FLUGPOST INTERNATIONAL; Großbritannien