1911 FIRST OFFICIAL U.K. AERIAL POST, PROOF OF LONDON ENVELOPE IN PALE YELLOW-GREEN POSTALLY USED WINDSOR TO NOTTINGHAM. Good to fine London envelope PROOF IN PALE YELLOW-GREEN, small tone spot upper right, from Windsor to 'Mr W Francis, 70 Mona Rd, West Bridgeford, Nottingham' with King Edward VII 1d scarlet tied very fine strike 'FIRST UNITED KINGDOM/AERIAL POST WINDSOR' date stamp SP 16 1911 Die 2. This event was so popular that the official stationery sold out immediately and the organisers permitted the use of such items as colour trials and proofs. Rare. (Ref 141481).
