Hi Martin,
Thanks for spotting the details. I hadn't really noticed that before!
I guess there is a possibility for some cross cultural decorative motifs at the top of the Région de l'Extrême-Nord in Cameroon with influence from groups in Chad? Although I thought the Guduf lived further south and west.
(and of course a very beautiful lance head, I think you showed it before, but it is really a great piece.

)