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It has 14 grooves and the twist is about 1x20. One very similar is in the 1925 Bannerman catalog and is described as Antique Cannon 1 1/4 inch bore, 13 rifle grooves, 47" steel barrel, screw breech, fired by curious outside lock and trigger. Thanks to all of you for contributing your ideas...

It is just normal rifling. I believe the ships had brass cannons so they wouldn't rust with the salt water. It certainly could have been used to shoot objects rather than people with that big of a bore.

I always thought Punt guns were smooth bore. This has rifling. There is no name and there is a picture of one in the old Bannerman catalog which only lists it as an antique cannon. The bore is about 1 1/4" . It looks like it was mounted to a carrier of some kind. Thanks for your comment.

[ATTACH=full It measures about 50 " and does have rifling. About a 1"+ Steel Screw breech