This blade has been vetted as authentic.   It is much rarer than the more common NGOMBE PRESTIGE SWORDS, especially with original handles.

They are often mislabeled as "executioner's swords", displayed ceremoniously to indicate the power of life and death held by the king. Highly prized, some could have been recognized and used as currency for barter, transactions and storage of wealth.

Thanks to Ethan Rider and Dan Mato for their expertise and help.