I would say that you have a Budu sickle knife from Congo there.
Compare "panga na visu" from Zirngibl & Kubetz, page 152, item 351. Also here you can see a similar piece:
http://www.africanarms.com/gallery?budu-37-cm
The rattan or plant fiber looks indeed a little bit like SEA work but the metal wrapping is typical Central Africa, so I have had a look inside "panga na visu"!

The local name is "alala".
The nicks suggest that it is a weapon.
Regards,
Detlef