http://www.invaluable.com/auction-lot/1876-77-1d-blue-on-laid-paper,-horizontal-strip-o-712-c-44e464cbe01876-77 1d blue on laid paper, horizontal strip of three IMPERFORATE VERTICALLY - M with full o.g. (toned), SG.31c, Cat. £700 for pair. Scarce item.
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