1881 1d. lilac 16 Dots Albino double print, S.G.K8(1) unlisted,

horizontal marginal block of 6 from the lower right corner of the sheet, Control 'W' in the lower margin, two large hinge remainders in the margins, light creases, fresh, original gum. R.P.S. Certificate 1996 states "Genuine as far as one can say". A VERY RARE AND PROBABLY UNIQUE CONTROL BLOCK.