I've handled once a keris from empu Djeno Harumbrodjo which has had also a polished surface. I think that the rough surface we know from old/antique Java keris blades coming only from the traditional warangan. I am sure that Alan will be able to tell us more in this matter. 
 
Regards, 
Detlef
		 
		
		
		
		
		
		
		
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