Great Britain 1969 5d Post Office Technology Commemoration Imprimaturs, SG808var

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.

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