Great Britain 1924 2s6d Purple/Yellow "Postage due" imprimaturs (1st Waterlow printing), SGD18var.
A very fine unmounted mint, with full original gum, bottom corner marginal "B24" control block of six imperforate imprimaturs, each stamp with a "BPMA" handstamp on reverse.
A spectacular and 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: £22,000.
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