Trench mortar? Naval mortar?

Wow, second link is a beautiful collection. I believe there are other threads on vikingsword.com about early breechloading canons and flintlocks, there was even a canon breach block loaded with original powder held in by a wooden plug.
 
I'd say it's a small land service mortar. Trunions on one is unusual as they tended to fixed 45 degree elevation with range changes made with powder charge. Larger (ie 14" bore) naval mortars had trunions so they could be laid flat when sailing to keep the center of gravity down in the ship. They where never fired under way as they'd light the sails up something pretty. Usually about 12' of the deck around the fireing platform would be covered with lead sheeting to prevent fires from burning powder residue, and to prevent sparks as the powder in mortars was always loaded loose.
 
The search term to use here is "Coehorn"

https://en.wikipedia.org/wiki/Coehorn
A coehorn /ˈkoʊhɔrn/ (also spelled cohorn) was a portable mortar developed in the Netherlands by Menno van Coehoorn in 1674 and in use from the seventeenth to the mid nineteenth centuries. Unlike larger, heavier mortars, the coehorn was designed to be movable by as few as four men.

Certainly looks like a modern replica - are there any markings on it? The hardware looks modern too.

Coehorns are small, but not THAT small. My guess is a 1/3 scale replica, don't recognize the model. Based on a land service type for sure, the rings on the originals were for inserting poles through so it can be carried by the mortar team. I suspect you will find the bore diameter fits a pop can suspiciously well. Value? Around $6 - 8? They go for about $8 ish new, depending on quality and construction.
 
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