1913-21 Watermark Crown over Double-lined A Thin Paper 2d Carmine and Deep Yellow-green irregular block of 7 with complete Harrison one-line imprint, and with additional variety 'Double Perforations' along base. One stamp with small tone spot on reverse, large part OG with lower four units MUH. A major postage due rarity, this being the only recorded imprint other than for a block of 24 in the Royal Collection, and as such one of the rarest Australian Commonwealth imprints. BW D99Bzd, cat AU$7500