Rick and Chumlee check out some super rare currency signed by the billionaires Warren Buffet and Charlie Munger, in this clip from Season 18, "No Sleep Til Vegas."

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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. Learn more: http://www.history.com/shows/pawn-stars