Hi Jeff, 
 
 I also think some form of power tool, using either human power or other means. These are typical "chatter" marks from a coarse grinder. 
 
In my experience with HuSa dha these grinding marks are common, although not usually as deep as your examples..
		 
		
		
		
		
		
		
		
		
			
				  
				
					
						Last edited by Ian; 12th March 2023 at 02:50 PM.
					
					
				
			
		
		
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