Exactly so David. 
 
Even the highly respected Surakarta Pakem book is at variance with popular opinion in many respects. 
 
The whole thing is this:- with keris there is no universal standard that can be applied across the board. My own background is firmly fixed in Surakarta ideas & practices, but this does not mean that those values are universal, it only means that the values & influences of the senior royal house of Jawa set a certain standard in places under its influence. In other places different values can & do apply. 
 
This widespread variation is something that perhaps makes it more important to understand --- or try to understand --- the societal & cultural values attached to the keris, rather than to try to understand the physical values.  
 
Within the Jawa-Bali nexus, there is widespread similarity in societal & cultural values that relate to the keris, whereas there is wide variance in the physical values.
		 
		
		
		
		
		
		
		
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