Here's a knife which could fit in the same category, although it's a bit smaller. There are no marks on the blade, but it could easily be an adapted European butcher's knife.
I got this one from a man who used to live in Congo before 1960. He said it was a hunting knife used by the (Ba)Kongo-tribe.
It has a simple, but sharp blade. It looks like a kind of large Bowie knife. The blade has a groove on both sides.
The handle is, in my opinion, made of bakelite with some copper wire to decorate it.
The sheath is made from leather and has on one side a loop for fastening it to a belt.
Total length : 42 cm. Length of blade : 30,8 cm. Width of blade : 3,5 cm.
