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:
US Airmail Eagle issue. en Image of Airmail Stamp cnt Eagle issue First issued September Post Office Smithsonian National Postal Museum Bureau of Engraving and Printing Imaging by Gwillhickers left px thumb Issue of PDUSGov Uploaded with Airmail stamps of the United States Blue stamps Stamps of the United States Eagles on stamps