Steve, thankyou for your appreciation. I am so glad to have contributed something of interest to this exceptional thread.
Here is an image of the action table:
[img]
https://www.dropbox.com/scl/fi/tq8r...rlkey=basx63akxtsboo3jrymqz5ksq&dl=0[/img]
Re. "6 5 2" an assembly mark, or similar, does seem more likely. I haven't seen it repeated elsewhere on the gun, but it may be: so far, I've considered it more prudent not to disassemble the lever or trigger work, though I've no doubt a full service is called for.
The barrels and locks are initialled, however. I'm told the "JS" on the locks is John Stanton, inventor of the rebounding lock, who was based in Wolverhampton and did work for some of the top-end London names (Purdey, H&H, Boss). I found this article on him when researching the gun:
Castles of Wolverhampton . The author was not named, but perhaps someone on here (knows who) wrote it!
As for the "JP" on the barrels (see below), a conversation with Donald Dallas a couple of years ago suggested that this was the mark of John Portlock, one of several generations of Birmingham barrel-makers. Dallas noted the similarity between the Fuller and a Boss pinfire in his possession, noting that Boss had sourced barrels from Portlock.
[img]
https://www.dropbox.com/scl/fi/693w...rlkey=8h1bj2h6lfyadl1z9qca64bmz&dl=0[/img]
