Air Mail cover 1919 (12 July) "Martinsyde" attempt supplementary mail envelope to London, bearing $1 on 15c. with St. John's machine d.s. for 12 July and with arrival c.d.s. for 7 January 1920; the envelope with vertical crease and slight soiling, the adhesive with a little gum staining, nevertheless very rare with only 25 letters carried. R.P.S. Certificate (1968). Photo
Air Mail cover 1919 (12 July) "Martinsyde" attempt supplementary mail envelope to London, bearing $1 on 15c. with St. John's machine d.s. for 12 July and with arrival c.d.s. for 7 January 1920; the envelope with vertical crease and slight soiling, the adhesive with a little gum staining, nevertheless very rare with only 25 letters carried. R.P.S. Certificate (1968). Photo
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