Miguel:
This is not my field at all. However, your knife does seem very unusual. Ibrahiim has checked out the readily identified sites online, as you probably have, and come up with nothing definitive. These throwing/currency/ritual knives are fascinating. Perhaps the unusual decoration is likely to provide an answer to your question rather than the shape of the blade(s).
There are a few people here with African expertise and someone will likely be able to help you shortly.
Ian.
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