PL.46 (AC AD BC BD) BLOCK OF FOUR BLUED PAPER (SG29)/MISSING IMPRIMATUR LETTERING. Good to fine used 1856 die 2 1d pl.46 block of four lettered AC AD BC BD red-brown on blued paper (SG29), minor soiling on reverse but good perforations and cancelled London "14" Inland numerals. AC and AD MISSING IMPRIMATUR LETTERINGS. (Ref 107518).