OWD:

I think Beesley action sans interceptors.

If you can get serial that would help (or description).

The pin in forend iron made me go "hmmm" too.

Barrels: gosh knows. Maybe recycled rib?

Too bad about the Miller. As good as a trigger as it is, shame to see an early Beesley (if that is the case) so altered. I tend to think guns like that belong in collections or museums.