Great Britain 1981 3d violet "Postage due" (Harrison printing), SGD5var.
A very fine unmounted mint bottom marginal pair of imperforate imprimaturs with full original gum, each stamp with a "BPMA"handstamp on reverse. Some light gum wrinkling as was prevalent across the whole sheet.
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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