Queen Mother Pendant Mask: Iyoba, 16th century, Nigeria, Court of Benin, Edo peoples, Ivory, iron, copper (?), H. 9 3/8 x W. 5 x D. 3 1/4 in. (23.8 x 12.7 x 8.3 cm), Bone/Ivory-Sculpture, This ivory pendant mask is one of a pair of nearly identical w