1D ARCHER PL.93 EXPERIMENTAL PERFORATION ON COVER (EC) (SG16b). 1853 mourning envelope London to Bath with fine 1d Experimental Archer pl.93 lettered EC tied London "41" inland numeral clear of Alphabet 1 check letters. London back stamp 21 DE 1853 and BATH receiver DE 22 1853. Good usage used before the official introduction of perforation. (Ref 100531).
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