If the dent is not visible inside the barrels that is a good reason to get the wall thicknesses measured as that may indicate that the bore had been honed.
As to the grade it appears to be a Facile Princeps action, and at page 121 illustration 249 of Graham Greener’s book there is a picture of a F16 or Forester grade gun with the same machine applied decoration.
F16 stands for Facile Princeps 16 guineas.
I can’t puzzle out the mystery marking ???PA?
Does it also appear on the other barrel?
Last edited by Parabola; 03/03/26 01:49 PM.
