black powder shotgun

[Keith Harris]

my grandfather gave me a black powder shotgun, and i am just trying to figure out the make of it, and the date it was made, does anyone know where i might find the info, or where to look, i put pics of the markings here, thank you ahead of time

 

[Thagomizer]

Belgian.

 

[52Bore]

Liege Belgium proofed.
18.2mm is the bore, when proofed.
Looks like twist steel type barrels.
Probably, mid - late 19th Century