Detlef, as I wrote in my earlier post, I cannot be certain from a photo as to whether this wood is burl teak or not. 
 
It is a burl, but I know of a number of burls that have very similar appearance. 
 
It looks like burl teak (jati gembol) but close physical examination would be necessary to be sure, a picture is just not good enough for certainty.
		 
		
		
		
		
		
		
		
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