hmm i had an old catalouge  from  an australian  ethnic weapons dealer , must have been about 20 years old,, and  in it were listed a  large array of fijian fighing staffs  in octaginal section ,, shown just as yours .. in variang lenths , i belive some may have an a small nob on the  grip also dont remember.. focrise , things like native clubs are always mislabled , so they could have just aswell came from any other area  in the pacific..  
 
japanese use wood plains.. and  so their carving is nice and even as any in europe from the same era,, also they use woods from their locality , none of which are very dense being a temperate zone.. so look at the wood and at the working of it and youll be able to tell......  
 
or ask some japanese wood worker if he kniws the wood..
		 
		
		
		
		
		
		
		
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