I think Ariel is right: at the "Petit Musée de la Recade" in Cotonou there is an object very similar to yours on display (
https://www.lespharaons.com/2020/01/...re-28-sceptres -royaux-du-dahomey-remis-au-benin-ce-vendredi /)
These are very particular objects, a thread on them would be interesting, even if they are not exactly "weapons" in the strict sense.