1841 1D RED PL.1B (NH)(SG7) USED ON COVER. Letter Cambuslang to Hamilton (Robert Brown correspondence) with a fine used 1d red pl.1B (SG7) lettered NH, close but clear to good margins, tied light strike black M.C. Backstamped GLASGOW MAY 5 1841 with boxed "7" local receiver in the usual watery black ink. Stamp shows "RECUT N" and 10 and 7 o'clock ray flaws. Cat £650. (Ref 96037).