Drawings by the legendary folk musician Woody Guthrie; an heirloom early-19th-century tavern clock made by Aaron Willard; and a five-carat, Asscher-cut diamond ring, inherited from the owner's grandfather.

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. Highlights include 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, and valued at $165,000 to $175,000.