Man's Hat
DR Congo
Pende, Yaka, or Suku people
Early 20th century
Natural fiber
51/2" high x 9 1/2" wide  (14 x 24 cm)

This appears to be the original fiber model upon which glass beaded hats were based on.  Those are used by several different groups. Elsewhere in the Congo one finds hats with the same protuberances on the sides and top, however they are embellished with shells.