Hello Gav and David, 
 
Of course I agree with you and I know how the seat from the blade inside the scabbard looks normally (like shown by Gav in several examples), especially by Malay keris. But I am nearly sure that this scabbard is already some decades old together with the blade, the patina inside the opening tells me that. Of course it could be a replacement scabbard, this never could be ruled out. But it's for sure not done from a dealer or collector I assume.  
I've owned and still own, especially some Bugis keris where the upside from the gonjo is in line with the opening in the scabbard.  
 
Attached a few close ups. 
 
Regards, 
Detlef
		 
		
		
		
			
		
		
		
		
		
		
		
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