PL.20 (AB BB)(SPEC C6)/MISSING IMPRIMATUR LETTERING. Good to fine used vertical pair 1855 die 2 1d pl.20 lettered AB BB several short perfs at top but BB fine used and cancelled London "20" Inland numerals. Important piece with AB MISSING IMPRIMATUR LETTERING WHILST BB STILL ON IMPRIMATUR SHEET. (Ref 107783).
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