£200 - £250
1911 (Sep 9) London to Windsor envelope proof in brown on light blue paper, enclosed correspondence sheet in the same colour, with KGV 1d tied by the Aerial Post c.d.s code "5", Great Yarmouth (Sep 11) arrival backstamp. A few stain spots but very scarce; a few proofs in unissued colours were sold and postally used. Photo on Page 8.
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