I have looked at a number of similar items, diregarding the hilt and just concentrating on the unusual blade shape. First I found a similar Kuba short sword posted previously on Ethnographical:
http://www.vikingsword.com/vb/showth...=African+Sword
On the site
http://www.memoire-africaine.com/armes2.html
I found the following that again on blade shape looked very similar.
Songye-Eki-Nsapo / Congo 1900-1920
Sword NGALA-Bangala
BENA-LULUA LUBA DRC
Glaive Tchokwé-Lunda 1900 Angola / Zaire
Cheers Cathey