Hi,
Very unusual rifle! The patch box is very well executed, tightly inletted. Also, from the looks of the wood, this is not a new rifle.
The paten breech is well done.
Like Dan says we need some overall pictures of the forestock. Your pictures are really good, but a view of the butt stock left and right, and the forestock left and right.
The crisp lines of the steel certainly shows the skills of a crafted gunmaker.
To be fair to the gun you should get a "GOOD" gunsmith to clean up the screws, and give you a good screwdriver.
Thank you for showing us this fine gun.
Fred