Wrongbacks and Printing Errors
A "wrongback" card is basically a printing error in which the card features one player on the front, and another player on the back. A wrongback may also have a blank back, rather than having anything at all on it. It is still considered a wrongback. Wrongback cards are also often found with half of two different cards on back, where the printing alignment wasn't set correctly. I've included pictures of some wrongback examples below:
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1941 Play Ball Lefty Gomez WRONGBACK
1987 Topps Roger Clemens / Bill Buckner WRONGBACK
1963 Topps Ellis Burton / Phil Linz WRONGBACK
