The photo is not very clear, therefore my answer is brief, without any additional
comment on the quality of the carving and on the patina.
This is an Ibeji from the town of Ilorin (Oyo) and it is classified as number 764
on the Catalogue of Ibeji and on the plates n. 478, 480, and 481 on the Encyclopedia
of the Ibeji. The degree of rarity is scarce.