Mainly a matter of craftsmanship, I suppose, Gavin. 
 
Since the gonjo is soft iron, it may also get bend from use which is culturally more likely than with keris Jawa for the last 1-2 centuries... 
 
There certainly are substandard keris Jawa, too. 
 
Regards, 
Kai
		 
		
		
		
		
		
		
		
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