1851 2D VIOLET BLUE PL.4 (SG15aa). A good to fine used horizontal pair 1851 2d pl.4 in the rare VIOLET BLUE SHADE (SG15aa), lettered BI BJ with four close to fine margins, cancelled "583" numerals of Nottingham. As singles cat. £3,600. Karl-Albert Louis certificate. (Ref 112870).
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