Looks much more like a mak than an ankus to me. A spear-mak hybrid rather than the usual single-edged blade. Might be a nice weapon to play with: better cutting than a normal spear, and the ability to trap/hook that you get with a winged spear.
Having neither an elephant nor one of these, I can't try one out as an ankus. In the absence of experiment, all I can say is that it looks so completely un-ankus-like that I cannot seriously consider it as a type of ankus.
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