Hi Dave I did not know this information. All the "Sport Americana Price Guide #4" says is "the backs are printed in a variety of colors (pink, yellow, brown etc.) 
At one time I did not even know what the yellow backs were

 I have a pretty good pile of these, most are the (gray/pink).
They must be "late" '64 because some of the cards mention 1965 events/models?
Larry
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					Originally Posted by  toppcat
					 
				 
				Larry-you have the 1964 (gray/pink) and 1968 Hot Rods (white/pink) both showing in case you didn't notice. 
			
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