Great Britain 1927 3d violet (Waterlow printing) imprimaturs, SG423var.
A superb unmounted mint, with full original gum, bottom marginal imperforate "G 27" control block of four imprimaturs printed on Mixed Furnish paper with "BPMA" handstamps on reverse.
A unique positional piece.
Exceptional provenance as they were released from the British Postal Museum Archives in 2014. Prior to this they were stored in the museum archives in climate controlled vaults since being printed and are therefore in uncirculated mint condition.
Stanley Gibbons value: £18,000.
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