I find it interesting. One of the fellows mentioned the lantern pattern is fro the mid to late 19th century. That, in combination with a flintlock suggests (to me) that it might have been a hobby project, possibly from that era. People had hobbies, and a sense of humor, even back then.
It looks as if that curved lever inside the hand guard must be the "trigger," activating a vertical rod, enclosed within the handle, that would trip the sear. That thing could potentially actually work, although accuracy, especially in the dark, by lantern light, would likely be "minute of side of barn." Judging by the bore size, it must be a smoothbore. Maybe it was intended to be loaded with shot, or rock salt, or okra seed, to deter nocturnal watermelon thieves.
Maybe it is some sort of steampunk firearm gizmo. I don't know. Is steampunk still a viable phenomenon? I don't hear much about it these days, although I think SASS may have a steampunk shooting category. We probably aren't supposed to discuss that, though.
Thanks for showing it!
Notchy Bob