138984 1911 FIRST OFFICIAL U.K. AERIAL POST/LONDON POST CARD IN OLIVE-GREEN WITH 'H.T.J.' ADVERT ON REVERSE.

1911 FIRST OFFICIAL U.K. AERIAL POST/LONDON POST CARD IN OLIVE-GREEN WITH 'H.T.J.' ADVERT ON REVERSE. A fine used London post card in olive-green addressed to 'Messrs. The Radio Co. Ld., 67 Fore Street, E.C.' with KGV ½d Downey cancelled good large part strike 'FIRST UNITED KINGDOM/AERIAL POST LONDON' date stamp SP 9 1911 code 2. On reverse 'H.T.J.' printed advert 'The 'H.T.J.' Autumm annual will fly higher than ever. Have you secured a space for your advertisement?'. A rare advertisement and the first example we have handled. (Ref 138984).