Great Britain 1970 1s6d "Philympia 70" Stamp Exhibition imprimaturs, SG837var.

A superb unmounted mint, with full original gum, bottom right hand corner marginal "Traffic Light" pair of imperforate imprimaturs each with a "BPMA" handstamps on reverse.

A scarce positional 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.