Keywords: Fort Sumter Centennial 1961-4c.jpg <big>Battle of Fort Sumpter</big> April 12-13 1861 U S Post Office; Bureau of Engraving and Printing<br>Smithsonian National Postal Museum; Image enlarged rendered for tone and clarity by Gwillhickers U S Post Office<br/>Designed by Charles R Chickering 1961-04-12 US Postage Stamp 1961 issue 4c commemorating the Centennial of the battle at Fort Sumter April 12-13 1861 Civil War PD-USGov History of the United States on stamps Stamps of the United States 1961-1970 Stamps designed by Charles R Chickering Stamps of the American Civil War Green stamps Commemorative stamps of the United States |