PL.15 (AG AH)(SPEC C6)/MISSING IMPRIMATUR LETTERINGS. Good to fine used 1855 die 2 1d pl.15 horizontal pair lettered AG AH L.C.14 (spec C6), both several short perforations and Irish cancellations. Short A row stamps from perforation adjustment and both are MISSING IMPRIMATUR LETTERINGS. (Ref 107647).