Usually the standard (as far as I have seen it used) is if the full original border is visible, it can get a numerical grade. If it's cut inside of that border, then it would just get Authentic.
The Post cards circa '61-'62 are good examples of this. There is a black border along the cards, and if this black border is visible all around the card, you can get a number. No black all around, then "A" is your grade.
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