Great Britain 1937 1½d red brown imprimaturs, SG464var.
A superb unmounted mint, with full original gum, horizontal imperforate pair of imprimaturs with N.P.M handstamp on reverse.
A very rare pair from the first approved printing sheet.
Provenance: National Postal Museum archive sale (1984/5).
Stanley Gibbons catalogue value: £6,500.
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