1931-36 Watermark Crown CA £1 grey John Ash imprint, BW54z, S.G.137,

interpanneau margin block of 4 from the foot of the sheet, John Ash imprint, lightly folded through the interpanneau margin, good colour, lightly toned large part original gum. EXCEPTIONALLY RARE. IT IS THOUGHT THAT THERE ARE PROBABLY NO MORE THAN TWELVE IMPRINT BLOCKS EXTANT.