The item has no copyright markings on it as can be seen in the links above. At lower left is the Tooker Company logo--they produced the lithographed poster--and Litho in USA with some numbers-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 1937 film ''A Family Affair''. |Source=[http://www.ebay.com/itm/A-Family-Affair-One-Sheet-Movie-Poster-Lionel-Barrymore-amp-Cecilia-Parker-1937-/191225096616?pt=LH_DefaultDomain_0&hash=item2c85e769a8&nma=true&...