Caucasian / Circassian percussion rifle?

[estcrh]

I won this on yesterdays Morphys auction, I was originally going to bid on an Ottoman military sword but when I saw how high the bids were on some of the other swords I decided to bid on this just in case. Having looked for images of these Caucasian / Circassian firearms before I know how hard it is to find images, let alone information. I was hoping from the auction photos that someone could confirm that this is what it was described as since I can not tell the equally hard to find Persian versions from the Caucasian / Circassian ones.

Caucasian Percussion Rifle.
Caliber .70, 32-1/2" barrel. Single shot percussion rifle with a two-stage barrel with three brass capucines, one mould ring and one German silver band at breech. Highly figured stock with bone or ivory inlays at wedges, sides of tang and two lines around butt. Steel ramrod. Circular butt plate with screw and plate. Showing wear and age patina. Stock needs splice repair, as does lock.