1844 1D PL.51 (NA)(SG8) LATE USE ON 1868 COVER. Envelope Brighton to Royston with 1d pl.51 (SG8) lettered NA, touched in two places and tied fine strike of the BRIGHTON/132 duplex NO 5 68 and back stamped ROYSTON NO 6 68. Late usage of plate 51 which was registered in 1844. (Ref 107884).