This is a beautiful sheet of 6 stamps, issued by Guinea in 2011, honoring Presidents of the United States of America. Featured on the stamps include the 31st President of the United States Herbert Hoover, Hoover's Vice President Charles Curtis, African American educator & author Robert Russa Moton, member of the U.S. House of Representatives from Illinois Oscar Stanton De Priest, US Secretary of War Henry L. Stimson, United States Attorney General William D. Mitchell, and Secretary of War James William Good. The sheet is Michel #8164-8169, and is Post Office fresh, mint never hinged, and F/VF.