13c Captain Cook, Vertical Pair, Imperforate Between (1733a var). Mint N.H., no trace of horizontal perforations between stamps or at top, complete row of blind perfs at bottom, making this a variety of No.1733a or an unlisted Vertical Pair, Imperforate Between, Very Fine, Datz does not note how many of the Imperforate Horizontally are recorded, stating only "very rare", presumably this variety is even more rare, with 1992 P.F. certificate stating No. 1733a variety "Vertical Pair, Imperforate Between", unlisted in Datz and Scott, the similar error offered in the next lot catalogues $4,250.00

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