Great Britain 1969 5d Post Office Technology Commemoration, SG808var.
Superb unmounted mint with full original gum corner marginal '2A.3B.2C.2D.' cylinder block of four imperforate imprimaturs each with a 'British Postal Museum and Archives' handstamp on reverse.
Showing slight gum disturbance in margin due to the mounting of the sheets by the Post Office, nevertheless a unique piece.
