It does appear to have a proof mark at the top near the breech, hard to make out as it appears the previous owner really polished the heck out of it. The muzzle is a cone as noted,,the barel is pretty thick down deeper,,it is as if the maker wanted a blunderbuss type effect,,no accuracy,,maybe it was meant to be a cannister shot effect ? One shot,clearing the decks ? The stock is walnut,and the brass triggerguard and other fittings appear well made. The touchhole is drilled through.
All very sound advice and taken in the spirit it is given gentlemen. It certainly won't "kill" me not to shoot it,but if there is any doubt it is dangerous I certainly won't. I paid little for it at a local shop that has since closed so I have no way of contacting the former owner.
Thanks again,,and if I can persuede my camera to co-operate in taking any detailed pics of the "proofmark" or any other marking I will put them up.