Polished Ground Stone Blade hot Post Neolithic Nigeria

This large spear shaped granite polished ground blade was found in Nigeria, and is ancient but after the Neolithic. I am not positive of the function, possibly a blade but as a spear projectile is a possibility. Measuring nearly 8 inches, it is large and heavy but sits well in the hand. As with all my antiquities this tool comes hot with a Certificate of Authenticity and lifetime money back guarantee!!