Chum calls in a memorabilia expert to examine a rare jacket worn by Will Smith, in this clip from Season 20, "Rick's Big Check."

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"Pawn Stars" follows three generations of the Harrison family as they assess the value of items coming in and out of their Gold & Silver Pawn Shop in Las Vegas, from the commonplace to the truly historic.

"Pawn Stars" follows three generations of the Harrison family as they assess the value of items coming in and out of their Gold & Silver Pawn Shop in Las Vegas. Learn more: http://www.history.com/shows/pawnstars