Great Britain 1877 3s slate blue Telegraphs Plate 1, SGL229var.
A superb unmounted mint, with full original gum, complete imperforate colour trial pane of twenty in dull mauve lettered "AA-ED" with inscription and plate number, each stamp overprinted "SPECIMEN" type 8.
A spectacular plated piece in pristine condition, very rare as such.
SG Catalogue Value: £2,600++.
