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LymanLeon, the card was cut from an order form inserted into the Sports Exchange for obtaining a complete set of "minis". An image of the front and back of the inserted order card is displayed on page 38 of Issue #14 of Old Cardboard magazine. Note that your Dizzy Trout card has a black border (unique to the order card). The cards in each of the three mini sets have either red, green or gold borders, depending on which set.
Lyman