£6,000 - £7,000
1930 Aeroplane overprint 1/-, Harrison printing with variety overprint inverted, mint single with margin at right, lightly mounted, reverse with four expert handstamps or signatures including Sanabria, S.G. New York and Peter Holcombe, with Holcombe Certificate (1991). A fine example of this rare variety, which occurred on just one sheet of 40 stamps. S.G. 117a, £15,000. Photo included on Front Cover.
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