Impossible Transfer: El Duco

A sealed enveloped is shown and signed by the spectator. A card is selected and signed (no force).  It is placed into a stand with a clear suspended holder.  The stand is covered with a cloth.  The cloth is removed and the card has vanished.  The envelope is opened and the card is removed from inside!  In used but good condition. 1988 from El Duco. The stand is 10 inches tall.