The item has no copyright markings on it as can be seen in the link above. At bottom left is Country of Origin USA, a logo for Morgan Litho Co., Cleveland, O-they printed the poster. and at bottom right 1A.
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:The_Main_Event_poster_1927.jpg
Original upload log
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{{Information |Description=Poster for the 1927 film ''The Main Event''. |Source= [http://40.media.tumblr.com/493e2ad5bdb150225c22c6f5faf94886/tumblr_n9u6m4WHQb1qg8r34o1_1280.jpg source] |Date=[http://www.imdb.com/title/tt0018130/?ref_=nm_flmg_act_17 19...
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