I'm leaning towards Solomon too right now (although there is nothing similar in the dutch museum databases). Perhaps a kid club?
I have found some of the Guyana area small wood dagger type clubs, none are made of this wood and are much less angular, could be that they just don't have this type (those are all made of hardwood, this still appears to me as a relatively soft palm wood).
But south/central America is a huge place so there could be another region where they use these clubs all the time ( the dutch museums mostly focus on guyana/surinam because it was an ex colony)
As for function:
I have no doubt you could stab someone with it, or club him. but to me in hand it feels like its made for throwing (or for tourists
)
The carving with the black inlay is still the odd thing on this club, normal inlay is white (lime) (the exception to this is Solomon tourist clubs and amazonian clubs)
I've included some pictures of tourist Solomon war clubs and amazonian clubs.