I was thinking of a sword inspired by the Bamun/Bamileke, due to the lot of engravings (too much for me
).But this is not the common shape of this area.
The handle seems to be inspired by the north tribe ( T shape) takouba...
The blade is ...a standard one like a ...roman glaive, or a Fang one !
The most incredible is the scabbard, I'm not sure it is cast in a mould, copper is a soft metal, it can be "repoussé" easily used in sheets.
Well it's hard to answer my friend with an exact origin.
1) it is a parade weapon made for prestige.
2) it belongs to a chief or a king, due to the copper and the work on the scabbard.
3) the blacksmith was a real artist.
Luc