In the 1882 Parker Bros. catalog the Qualities R, S, T & U were listed with TWIST barrels, and the Qualities N, O, P & Q were listed with FINE ENGLISH TWIST barrels. I've never seen a rib marking other than TWIST or STUB TWIST.
By the circa 1900 "blue ink" catalog the Qualities N, O, P & Q are gone and only the R, S, T & U with TWIST barrels remain. In the Hammerless guns the Qualities PH & NH are listed with FINE ENGLISH TWIST barrels.
By the "Pine Cone" and "Flying Brant" catalogs both the hammer and hammerless guns are listed with ENGLISH TWIST barrels, no more FINE.
A bit of a disconnect between what the folks in the office were writing in the catalogs and the folks in the factory were marking on the ribs.
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