Great Britain 1958 1s6d grey-blue (Wales, cream paper) imprimaturs, SGW6var.
A superb unmounted mint with full original gum bottom marginal horizontal pair of imperforate imprimaturs each with a "BPMA" handstamp on reverse, showing central sheet diving arrow in margin.
A scarce Queen Elizabeth II imperforate pair of imprimaturs.
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.
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