This Yoruba offering bowl has been vetted as authentic but with little age or use.
These bowls are used to hold kola nuts as offerings of hospitality or as receptacles for the sixteen sacred palm nuts used in divination. This form, with the bowl on top, is known as an Agere Ifa
Another form, with a kneeling female figure with lidded bowl, is known as an Opon Igede Ifa can be seen on Offering Bowls Page 2.