Interesting and astute observation on the slot screw on the socket which seems attached 'over' the riveted langets, Fernando.
The blade form and being attached on a 'pole' is what made me think of the Japanese (and Chinese) 'naginata, though the curious blade markings and unusual fullers made me think European.
The squared rivet heads on the langets resemble European types and arrangement, much as on many lances.
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