This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Flag of Truce cover c. en US mail Inspector's manuscript with Washington cent tied br War Flag of Truce mail Post Officebr si edu asp con cmd mode tid Smithsonian National Postal Museumbr image obtained by Gwillhickers Post Office PDUSGov Postal history of the American Civil War Stamps of the United States