Hi Andy,
That was my initial thoughts, either an Admirals barge or a Captains gig but the layout with the cockpit in front of the helmsmans position, which is also enclosed permanently which is wrong, at least for any navy boat I've seen.
I think this is a sixties or seventies kit, all solid plywood and brass bits including rudder and prop, although I think it has been remotored.
I do like to find out the origins of the boats I acquire, it's like having the final page in the book and finding the rest of the story.
Roger