1911 FIRST OFFICIAL U.K. AERIAL POST/THE LONDON POST CARD IN OLIVE-GREEN USED FROM WINDSOR. A very fine example of the post card in olive-green inscribed "from LONDON to WINDSOR" but in error used from Windsor to Woking with KGV ½d Downey cancelled superb FIRST UNITED KINGDOM/AERIAL POST WINDSOR date stamp SP 16 1911 die 2. Most attractive and rare. (Ref 102830).
