£200
1911 (Sep 16) London to Windsor envelope proof with enclosed notepaper, both in an unissued green colour franked by a KEVII 1d tied by the Windsor Aerial Post c.d.s code 2, Caterham Valley arrival backstamp (Sep 19). Part flap missing and a few minor edge faults but a scarce postally used proof envelope, flown from Windsor. Photo on Page 10.
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