Any British-marked pinfire from 1856-57 is interesting, as those were early days for the system. That is a fine target/gallery pistol.

The study of pinfire pistols and revolvers is a field in itself, on which I've spent little time and energy. Most research to date seems to have focused on them, rather than on sporting guns.

I will soon add a few more game gun examples to this thread, having secured a second Thomas Horsley, and a Charles Osborne. I just need to find the opportunity to take some pictures.