There are no copyright marks. At bottom left is This lobby display leased to the exhibitors by Tiffany. At bottom right is The Ullman Mfg. Co. NY.-they printed the card.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
{{Information |Description=Lobby card for the 1931 film ''Caught Cheating''. |Source=[https://web.archive.org/web/20170705144700/https://images-na.ssl-images-amazon.com/images/M/MV5BYjY3NTM3YjItNGJjMS00ZjU2LTlkOTctZDQ5YjQ1M2QzZmI3XkEyXkFqcGdeQXVyMTcyOD...