In an auction last month there was a rifle that looked like it was made by the same maker. The rifle was listed without a makers name.

I did a little side by side comparison not the same rifle but could be the same maker.
I revise my SWAG. I think the first and third photos are definitely the same rifle but not the middle one. Look at the wood at the back of the loading port where it sweeps upwards just immediately in front of the lyman sight.
Also the flute on the nose comb might be a bit different - not so sure of that.
It is a fun detective game to be sure.