1D ARCHER PL.99 EXPERIMENTAL PERF (BA) (SG16b) ON COVER. 1851 envelope (slight soiling but with original letter) London to Louth, Lincolnshire with a good used Archer Experimental Perforation from pl.99 lettered BA tied London "21" inland office numeral. On front LOUTH date stamp JU 8 1851 in blue and London date stamp JU 7 1851. Cancellation clear of Alphabet 1 check letters. Good early usage before introduction of official perforation. Matched with four margined 1d imperf. Cat £2,600. (Ref 100527).
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