There are three or four 'Berks' rifles with the same incised carving motifs in the same locations as the Corgey gun. Aside from this one at least one of the others is signed, if memory serves. The unsigned pieces are much the same though. The patch boxes on those guns are finial and lid, of brass construction. Mike D'A had two or three of them some time ago. All nice rifles and strongly suggestive of Reading if not of Berks, generally.
Dick