1911 FIRST OFFICIAL U.K. AERIAL POST, POSTALLY USED PROOF IN LIGHT BROWN FROM LONDON TO BRISTOL. Very fine used London envelope PROOF IN LIGHT BROWN from London to 'Messrs Parsons and Son, Jewellers, Old Market Street, Bristol' with KGV 1d Downey superb strike 'FIRST UNITED KINGDOM/AERIAL POST LONDON' date stamp SP 9 1911 Die 1. The demand for envelopes and postcards was so strong that a few proofs were postally used. Rare (Ref 141478).
