1D RED PL. ELEVEN (SG7)(CE) ON COVER LONDON TO DEREHAM. Letter London to Dereham with fine used 1d red pl.XI (SG7) lettered CE with four close to good four margins tied black M.C. On front DEREHAM date stamp AP 18 1841 in red. Stamp shows fine "7 o'clock ray flaw NE square". (Ref 112136).