Great Britain 1877 £1 Telegraph colour trial, SGT17var

Great Britain 1877 £1 Telegraph colour trial, SGT17var.

A superb unused, with original gum, imperforate example lettered 'AH', printed in dull mauve overprinted “SPECIMEN” type 8.

A scarce specialised philatelic piece.

Stanley Gibbons catalogue value: £800.

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