That seems to be good evidence of a print variation. You should put the card under a strong loupe and/or otherwise enlarge it. This could reveal whether there is pressure or indentation from an ink pen or, conversely, if the black is actually part of the dot pattern.
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If we are to have another contest in the near future of our national existence, I predict that the dividing line will not be Mason and Dixon's but between patriotism and intelligence on the one side, and superstition, ambition and ignorance on the other. - Ulysses S. Grant, military commander, 18th US President.
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