The Ejagham / Cross River head below has been vetted as authentic with signs of use and age..

EJAGHAM
HEAD 17
26" high x 17" wide x 7.5" deep
Nigeria
$600
SOLD

This unusual head, very realistic by tribal standards, is unfortunately in bad condition.  The ears, which were probably separate pieces of wood, have been lost.  The areas above the right eye and around the base are still fragile. The rest of the head is stable.