From the 2013 Standard Catalog:
"Each of the first 115 cards in the 1939 Play Ball set can be found with red overprinting on the back indicating sample card status. Collectors will pay a small premium for a type card of a common player. Sample cards of most star players sell for about double the price of the regular-issue cards, while DiMaggio and Williams samples sell for about the same price as their regular-issue cards."
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