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 potcard. An example of the United States Postal Service postcard with preprinted Presorted Standard mail postage USPS Presorted Standard Personal collection Scanned and processed by Michael Romanov GFDL ccby PDUSGov Advertisements on postcards of the United States Postal stationery of the United States postmarks