Great Britain 1963 1s6d Opening of COMPAC "Trans-Pacific Telephone Cable" (Ordinary) imprimaturs, SG645var.
A superb unmounted mint, with full original gum imperforate top marginal horizontal pair of imprimaturs with "BPMA" handstamps on reverse, showing central marginal arrow in margin.
A scarce pair from the first approved printing sheet.
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.
Last sold by Stanley Gibbons in 2015 for £4,500.
