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					Originally Posted by Pat R   | 
	
 I believe that some were. Most of the missing color cards are missing two colors. And a lot of cards show pairs of colors in registration with each other but not other colors. 
The cards with the nail mark on the other hand are almost for sure a product of a flatbed press, as the nail would have been in the impression cylinder, and there's no reason a press with metal rollers would have a nail.