1913-21 Watermark Multiple Crown over Double-lined A Thin Paper 1d Scarlet and Pale Yellow-green Perf 14 Cooke printing CA monogram block of 12 from lower right corner of sheet with additional variety 'Double Perforations' along bottom row. Minor perf separation reinforced with hinge, fine with large part OG and most units MUH. A unique combination. BW D97Bb/zb, cat AU$750 for hinged monogram strip of 3, with 6 x double perf catalogued at AU$900