Quote:
	
	
		
			
				
					Originally Posted by  deltaarnet
					 
				 
				Here is the card it was given a Authentic Grade by PSA Pop 4 none higher? If you look up the pop report for 1970 Topps Super you will see ALL Square corner Proofs only have a Authentic grade.  Why?? 
			
		 | 
	
	
 As stated, it's a proof of the Killebrew card that was likely cut from a sheet.  The '70 Topps Supers had rounded corners.  All of the proofs should be graded as authentic.