£1,200 - £1,500
1934 (December) Stamp Printing Office die proofs of the 1935 Air Mail issue, sunk into thick card, with dates and numbers on reverse as follows: 1d green 20/12/34 No. 5, 3d blue 21/12/34 No. 8, 6d brown 20/12/34 No.37. Probably unique in private ownership. Ex Sir Gawaine Baillie SG 570var/572var
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