unused 4d. grey-brown, plate 17, variety imperforate, a horizontal pair lettered AK-AL from top-right corner of the sheet showing plate number and large part red "(crown)/POSTAGE/4d." marginal handstamp; some light gum creasing and minor printing ink offset on gum but still fine and fresh. A great rarity, possibly unique. S.G. Spec. J67e, £4000+. Photo