Well, it seems as if nobody else wishes to comment. 
 
Yes Detlef, I also would be inclined to place this keris as East Jawa/Madura. The wrongko is capu kagok, and that is a common form in Madura, the mendak style is common in Madura. The planar hilt could well be either a Madura or East Jawa hilt, usually the cecekan in the non-Jawa tengah ones is a bit different to ones from the heart country. 
 
Here is the blade in an easier to read orientation. 
 
The references I have for dhapur are all for Surakarta, in my opinion, even if this dhapur exists in one of those pakems, it probably should not be applied to this keris.
		 
		
		
		
			
		
		
		
		
		
		
		
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