GREAT BRITAIN, 1840, 1p Black (1; SG 2; SG Specialised AS5h).
Plate 1b, lettered M-C, featuring recut side-line at left,
unused (no gum), huge to full margins showing small part of adjoining stamp at top, deep intense shade, small thin spot mostly in bottom margin, Extremely Fine appearance, a rare unused Penny Black from plate 1b, with 2019 B.P.A. certificate, SG Specialised £13,000
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