While I could go with an African bearing sword, I've seen that circle on Chinese blades before.  I agree with Gav: it feels like a composite piece based on a Chinese original.  I'm not happy about the rawhide(?) and copper wire binding.  It looks crude.  My guess is that the basal half of the blade was cut down from a longer sword, and/or the base was welded onto an existing chinese sword blade.  The function of the current piece is what I don't get. 
 
Best, 
 
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