The item has no copyright markings on it as can be seen in the links above. At lower right is Tooker Litho Co. NY At lower left is Litho in USA and a number-probably the job number of the poster.
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=Poster from the 1938 film ''Three Loves Has Nancy''. |Source=[http://www.ebay.com/itm/Three-Loves-Has-Nancy-One-Sheet-Movie-Poster-Janet-Gaynor-Robert-Montgomery-1938-/191239543802?pt=LH_DefaultDomain_0&hash=item2c86c3dbfa eB...