It looks to be a light (10 or 20 pdr) parrot gun. Keep in mind that the barrel, breech and trunions (the cylinders connecting the gun to the mount) were cast as a single piece, with a reinforcing band of wrought iron wrapped around the breech. Your model has the trunions as a separate piece. The barrel also tapers along the length, and the muzzle often had a flair. The barrel also looks too long, especially the portion aft of the trunions.
On a detail note, this was a rifled cannon, and the description and ID of the weapon were often engraved on the muzzle. http://markerhunter.wordpress.com/2010/03/14/20-pdr-or-3-67-inch-army-parrott-rifle/ has some nice detailed images.
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On a detail note, this was a rifled cannon, and the description and ID of the weapon were often engraved on the muzzle.
http://markerhunter.wordpress.com/2010/03/14/20-pdr-or-3-67-inch-army-parrott-rifle/ has some nice detailed images.