Hi Rick, 
Thanks for your answer. There are two angles to consider:  
The first that you mentioned with your first picture: is not 90°. It is systematically slightly off 90°. 
The second is the clearly seen on your second picture : If you prolonged the Axe  of the ganja you have clear angle with the Axe of the blade. 
I have read something somewhere, but can't remember where and it was linked to fighting with keris. I do not believe very much in the fighting abilities of the keris and think that many of its Subtleties are derived from other reasons. But one never knows ! 
I am ready to listen to any valid explanation  
Thanks, regards, 
Michel
		 
		
		
		
		
		
		
		
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