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But all old versions I have seen examples of in any literature have universally been ribbed or studded.
As Chris as pointed out it is some what of a rare weapon to be used I do not think it is even listed as a weapon of the Bugei Juhappan.
As Brandt shown this is one that is commonly used. Mostly those who use it I think are Bandits or similar folk and of course the mythical Oni.
It is used like a bat or swinging action so I doubt Samurai used it.
However if someone can name a particular ryu-ha who used it I would be interested.