This 3¢ magenta stamp from the United States, issued in 1940 as part of the Famous Americans Series, honors Cyrus Hall McCormick (1809–1884), the inventor credited with mechanizing agriculture through his reaper. The detailed engraved portrait highlights McCormick’s legacy as an industrial pioneer who revolutionized farming practices in America. Issued for everyday postal use, the stamp also features a symbolic emblem of agriculture and industry at the lower left. A fine collectible for enthusiasts of U.S. history, agriculture, and classic definitive issues, it remains a valued piece in the Famous Americans set.