Great Britain 1913 9d Agate imprimatur, SG392var.
A superb unmounted mint, with full original gum, left hand marginal imperforate imprimatur from the Post Office registration sheet with "NPM Imprimatur" handstamp on reverse.
Very rare, only two single examples and a block of four were released from the museum.
An extremely rare King George V "Profile Head issue" imprimatur from the first approved printing sheet.
Provenance: Ex. National Postal Museum Archive sales.
Stanley Gibbons catalogue value: £7,500.
