Four of a kind, representing all four suits are shown front and back with the backs all red.  A different face card is added to the others, and it is shown to have a blue back.
 
The different card and one of the fours is placed down face up and one of the fours is placed face down.  The other two fours are shown and put away.  The spectator is asked for the color of the backs of the face up cards.  He is WRONG!  One of the cards does not even have a printed back.  He correctly identifies the face down card, but, when it is turned over, the face has changed colors.
 
Condition Notes:  Overall complete and in very good condition with only minor age-related wear and possibly some light discoloration.