Great Britain 1964 2½d 20th International Geographical Congress (Ordinary) imprimaturs, SG651var.
Superb Post Office fresh unmounted mint with full original gum imperforate left hand marginal horizontal pair of imprimaturs with "BPMA" handstamps on reverse, showing variety "Retouched lawn" in position R11/1.
A unique and remarkable item.
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.
The first International Geographical Congress was held in 1871; since then one has normally been held at four-yearly intervals. London was chosen in 1964 and the Congress lasted from 20 to 28 July.
GB Specialised Catalogue No: W46c
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