Great Britain 1913 black/yellow (watermark Royal cypher) imprimatur, SG390var.
A superb unmounted mint, with full original gum, imperforate left hand marginal imprimatur with "BPMA" handstamp on reverse.
A scarce King George V specialised philatelic item from the first approved printing sheet.
Exceptional provenance as it was released from the British Postal Museum Archives in 2014. Prior to this it was stored in the museum archives in climate controlled vaults since being printed and is therefore in uncirculated mint condition.
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