1911 FIRST OFFICIAL U.K. AERIAL POST LONDON ENVELOPE IN BRIGHT GREEN TO RICKMANSWORTH, HERTS. A fine to very fine used London envelope in bright green to Rickmansworth, Herts with 1d Downey Head cancelled very fine strike 'FIRST UNITED KINGDOM/AERIAL POST LONDON' handstamp SP 9 1911 Die 3. Insert accompanies 'As a momento of the inauguration of the Aerial Postal Service I am making sure that you receive an aerial stamp though the post .......knowing what keen collector you are....'. (2 items) (Ref 143686).
