A friend brought this out of his closet a week or two ago. He's a little hazy about when/where he picked it up long ago, but we both agree that we've never seen anything like it - especially the inlay on the barrel.
Anyone have any clue about this one's origins? I don't even know where to start! There are no manufacturer's name, model or caliber stamped into the metal.
That's the right side, now look at the top:
More photos to come...