So a friend of mine who is a local antique dealer showed me this today. The hilt and scabbard are made of bronze. The blade, which is flat and unsharpened, is iron. The knife and scabbard together must weigh more than 2 lbs / 1kg. The back of the hilt is hollowed out, as is part of the scabbard.
African? European? Asian? Ceremonial? Movie prop?
It's mine for the taking if I want it...
I didn't even think to check to see if the hilt was hollow in the grip, or if I could see the tang... but I'll be seeing him later this week.