These extremely rare masks were used at the introduction ceremonies of the hunting or warrior societies. The Nzakara ethnic group is one of the equatorial Bantu peoples, originally located between the Central African Republic and the Democratic Republic of Congo. In the course of the 18th century they were conquered by the Mangbetu, later by the Zande. As a result of these evolutions, the original Nzakara style has merged with the Zande and Mangbetu styles and is sometimes difficult to discern.
The book "100 Peoples of Zaire and their Sculpture" by Marc L Felix (Brussels) shows a reference on page 138.