Thank you to everyone for your input. Last night, I took a slightly damp sponge and tried to wipe it very gently to see if anything could be removed. I could tell that the card would swallow up any moisture it encountered so I used very, very little water. Nothing wiped off and after examining it further, I am not so sure that its not some kind of printing anomaly.
At this point, I'm just going to leave it as is and put it in my display case.
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