1856 DIE 2 1D RES. PL.20 IMPRIMATUR LETTERED AH WATERMARK SMALL CROWN INVERTED (SPEC C7). A very fine top marginal imperforate imprimatur 1856 Die 2 1d reserve plate 20 lettered AH with marginal inscription, alphabet three check letters and WATERMARK SMALL CROWN INVERTED (Spec C7). Only three imprimatur sheets had this combination of alphabet three check letters and watermark small crown, Die 2 plates 22, 24 and reserve 20, this sheet the only one with watermark inverted. A rare and important imprimatur. (Ref 142425).
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