From an SCD article:
You can tell if an Exhibit card is authentic rather than a reprint by looking at the back of the card. Reprints are usually on white or dark gray stock. (Some reprints were actually printed by ESCO on white stock in the 1970s.) Authentic cards are on light gray/tan stock (you might describe as sepia toned) and show some edge discoloration from exposure to sunlight and handling.
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