Hi,
I also tend to think it's african, just by looking at its 'crude form'.
In 'Afrikanische Waffen' by Werner Fischer and Manfred A. Zirngibl, there's a picture of a strange looking dagger. According to their sources this knife/spearhead is Bambuti (Mbuti). Page 76, fig. 122
Here is what is written :
The pygmies don't work with metal. Instead, they acquire their knives and spearheads by trading bagged quary for them. The knife shown in fig. 122 is typical. The handle is attached to the shaft of what was likely a spearhead.
The length of this knife is 31 cm, with cord-plaiting on the handle.
Probably your knife could be such a 'recycled' spearhead.