That is the listing. The overall first impression is simply the mass and size of the gun. I had never considered it as being a pigeon gun due to being a single shot. I am not familiar with England but I thought that until the advent of artificial targets in the US that trap guns were pretty much all doubles because two shots were allowed at birds.
I would have sworn after handling it that it was intended as a market gun for ground shooting. As I noted I own a Paris gun from the 1870's that is very, very similar: same ga, barrel length, weight etc. The only difference is that it has a sort of wide vee sight attached at the rear.
The minor pitting in the barrel turned out to be really minor. It almost looks like the barrel is simply dirty and appears as very small speckling. I believe a good cleaning or very mild honing would make it disappear. The barrel walls are so thick that they could be totally refurbished with no issues. I think a good cleaning and polish will work wonders. Probably a moot point because at my age swinging this gun on a target may be past my tool set.