There are no copyright marks on the item. At lower left is the Universal logo and Country of origin USA (in border). At lower right is the Morgan Litho Company, Cleveland, logo-they printed the poster.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country. Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Back_to_God%27s_Country_poster.jpg
Original upload log
The original description page was here. All following user names refer to en.wikipedia.