To the best of my knowledge this keris form is associated with North Borneo/Brunei. 
 
The state execution keris of Brunei was made in Brunei in 1842 and is of this form. 
 
I have seen keris of this form and in worse condition than this, but without a hole in the blade go for much, much higher prices than this. 
 
In Queensland, Australia some years ago a regulation was in force that resulted in many keris being secured in their scabbards by a hole being drilled through scabbard and blade and a nut and bolt being inserted in the hole.
		 
		
		
		
		
		
		
		
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