United States postage stamp plate block featuring William McKinley, 25 cents, Scott #829

This stamp was issued in 1938 as part of the Presidential Series, commonly known as the 'Prexies,' which featured portraits of all U.S. presidents from Washington through Coolidge. The 25-cent denomination depicted William McKinley, the 25th President of the United States who served from 1897 until his assassination in 1901. The Presidential Series was designed to provide a comprehensive set of definitive stamps for everyday postal use while honoring American presidential history. This plate block format, showing four connected stamps with selvage margins, is particularly valued by philatelists who specialize in U.S. postal history and presidential memorabilia. Collectors prize these blocks for their historical significance, the quality of the engraving, and their connection to one of America's most ambitious stamp series. The Presidential Series remains one of the most collected U.S. stamp issues due to its comprehensive scope and the period it represents in American postal history.