Hi Tim, 
 
I was thinking of the Japanese hanbo, which is about 3 feet long and 1 to 1.5 inches diameter.  It might have a hole drilled near one end for a wrist loop.  Basically, the smooth, relatively even club with an octagonal cross section seems like a Japanese thing to me. 
 
Without doing a (destructive) wood test, there's not much way to tell, unless you have something in the way of provenance.   
 
Anyway, it's just my opinion.  I'd be happy to be wrong. 
 
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