antique shotgun identification help
 

hi all. first time posting here.

received a shotgun when my grandfather passed away and i've had a hard time finding info. thought someone here could point me in the right direction. thanks all.

it's in excellent condition, good petina and i mostly only included pics of the gunsmith markings to see if anyone can help me identify the approximate age and worth.

thanks again everyone

shotgun
 

its not american made,its got some imerial crown mark