Thanks to Vandoo & Fearn for their comments.
The similarity between these clubs and the Maori taiaha is very interesting.
I had a good look at mine and can't see any evidence or residue of a fibre wrap at one time. But the handle part has that slight "rippling" in the wood, that can mean stone-carved. Perhaps the lack of decorative elements including a central ridge means an earlier date ??
Certainly feels good to swing in the arms, and would be a deadly weapon in the hands of a warrior trained in their use since childhood