One of the largest collections in the Ethnology Sector of the National Museum is the Rondon Commission collection, with about 1,500 items. As Rondon advanced over Indian territory, his staff collected and sent pieces and artifacts from various groups to the National Museum. This piece is part of a collection among the Nambikwára in June 1929. The contact of the Rondon Commission with the Nambikwára was described by Roquette Pinto (former director of the National Museum then occupying the position of naturalist in the Section of Anthropology), in His book Rondônia, of 1912.