Being paranoid about anything  with the  "Chinese Connection", I would advice thorough but gentle cleaning with WD-40 and a soft cloth.  There is a lot of red (fresh?) rust and the Chinese are masters of artificial aging.  The handle is of South Indian style, with a convex base, but I have never seen such a long wavy blade on a katar, almost a Moro Kris.  Katar is supposed to be a stabbing weapon; this one is mostly a "slasher". My fear is that cleaning might reveal signs of recent "marriage".  Look for a rivet of strange coloring, thermal damage  etc. 
 If I am wrong, congratulations, you got yourself a winner!
		 
		
		
		
		
		
		
		
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