Brass bell or gong in the form of a human head. A loop on the top would have served as a handhold or place to tie the instrument. The opening of the the instrument is squared and flat in order to rest upright.
Gongs are used in Yoruba communities for communication, music, and religious ceremonies. This gong belonged to an ogboni secret society. The ogboni societies have religious and civic functions. Gongs were used by the ogboni to swear in witnesses in disputes. The gong calls ancestral spirits to hear the testimony and will punish those who give false testimony.