Hello bvieira,
Surely this is a meat cleaver, judging by its design and as supported by Madnumforce; and one which doesn't seem to be directly associated with any weapon typology.
Not that such beast couldn't be used as a weapon, though
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Let us move this thread to the (non weapon) Miscellania forum, to check whether further opinions are consistent with the ones already given.
And by the way, i saw a cleaver the other day in a local street fair, which fully resembled your nice piece.