The fact that Leon's example is a blank back makes the piece quite intriguing. (Not seeing the back of the Miller card...) I would be a bit more skeptical of an otherwise normal card with such "marks." It seems too easy for someone to turn a $15 common into a $150+ peculiarity by adding some kind of mark and pass off as a printer's mark(s).
No allegation here, but in an era where a portion of a letter missing or a shade difference in color has collectors clamoring for a card, you can never be too cautious.
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