Hi Mark
Such a pitty you didn't get it; very serious stuff ... so it looks.
Rather reinforced barrel, wide ( or worn) touch hole, large caliber ... meaning XIX century or even prior ? Not old enough to de considered a hand cannon, though ?
Also not a coehorn mortar ... It would need trunnions placed low, by the breech, for the rotation, right ?
It has a cascable, though ... was it moveable ?
I'm glad there are no experts around, to shut me up
.
Fernando