1911 FIRST OFFICIAL U.K. AERIAL POST/USED LONDON POST CARD IN OLIVE-GREEN CANCELLED DIE 5. Fine example of the London post card in olive-green with KGV ½d Downey cancelled good to fine strike FIRST UNITED KINGDOM/AERIAL POST LONDON date stamp SP 11 1911 with the scarcer die 5. Dies 5 and 6 are much scarcer as they were used at Hendon airport on mail collected locally and from the John Barnes and Roper's stores. Card addressed to Hendon. (Ref 104509).