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In Crystal Bridges Museum of American Art, Hour 1, Nicholas Cline appraises a Magnolia Petroleum Co. porcelain sign, ca. 1930. Antiques Roadshow is available to stream on pbs.org and the free PBS App, ...

Vintage advertising signs have become cherished collectibles that offer a unique glimpse into the past. These items are more than just relics — for collectors, they’re a slice of mid-century American ...