It is 34" long and just over an inch at the distal end . Is that near or off Japanese standard size? The polish and patina to the wood does give me a little hope to hold on to. I know that todays martial arts kit is not polished or has patina but would one from the late 19th early 20th century be so
Having googled images "hanbo" I am no longer so sure it is a hanbo. Like swords most stick weapons are in universal size perameters. The Japanese may have famous schools and names for weapons but lets not forget that a club or stick weapon is exactly that and the South Seas peoples fought with clubs for thousands of years surely they new all the moves or more too. There is something about the finish so similar to all my other clubs that also makes me not so sure any more of it being a hanbo but the doubt the other way is still there, sadly.

Certainly untill better information or another edxample is shown.