Odd pommel, but I would say Shan States (Burma) or northern Thailand.  I've never seen one quite like it.  I suppose that it could be an executioner's sword, though I do not think that any particular features make one such, just how it was actually used.  In other words, while dha/daab were certainly used by executioners, as far as I know there is no such thing as an "executioner" style dha, as you have with keris for instance.  They just used any ol' dha they had.
		 
		
		
		
		
		
		
		
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