At a Las Vegas, Nevada, magic theater, ANTIQUES ROADSHOW host Mark L. Walberg and appraiser Nicholas Lowery reveal that the artistry - and value - of vintage magic posters is no illusion. Appraisers at the Las Vegas Convention Center don't need sleight-of-hand techniques to pull amazing discoveries out of the crowd, including drawings by the legendary folk musician Woody Guthrie, given to the owner's journalist father after an interview with Guthrie; an heirloom early-19th-century tavern clock made by Aaron Willard of the renowned Boston clock manufacturing family; and a fabulous five-carat, Asscher-cut diamond ring, inherited from the owner's grandfather, owner of a jewelry store/pawn shop in a Colorado mining town. The tearful owner realizes she's hit pay dirt when the ring is valued at $ 165,000 to $175,000.