Ooops, I'm sorry...
this link should be working:
http://www.gianisa.com/blade/art/random/japset1.jpg
And yes, it is Kagehisa Anotsu's battle-axe from "Blade of the Immortal".
Thank you everybody who may provide a clue.
BTW, another character's sword is named either "Grand Turc" or "Grand Turk"... does anybody know of the word "turk" or "turc" ever being used to refer to a kind of European blade? I'm attempting to estimate the proper spelling...
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Raffaele