An interesting piece of information possibly pertinent to these swords comes from a comment that the head weapons curator at the Thai National Museum made to our intrepid field operative, Dan Wilke.  She said these look a lot like old Thai cavalry polearms.   
 
One wonders if it is a case of derivation, or of convergent evolution.  I don't imagine that there is much in the way of cavalry used up in the mountains of Annam, and a longhandled blade has its advantages apart from being able to reach people on the ground from the back of a horse.  Still, I have this fantasy of a lost Thai cavalry unit settling down in the highlands and passing down their familiar chopper design to their decendents.
		 
		
		
		
		
		
		
		
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