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:
Union c. en US Postage stamps on cover issuesbr cent Washington issue was commonly used by Union soldiers during the American Civil War The cent issue is the most frequently found on Civil War era mail br Post Officebr si edu asp con cmd tid Smithsonian National Postal Museumbr image obtained by Gwillhickers Post Office PDUSGov