The item has no copyright markings on it as can be seen in the links above. At lower left is the name of the company, Tooker, who printed the poster, Litho in USA and a job number.
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 for the 1936 Our Gang film ''Pay as You Exit''. |Source=[http://willmckinley.wordpress.com/2013/05/05/screening-report-the-kid-1921-at-film-forum-chaplin-look-alike-contest/ site] [http://willmckinley.files.wordpress.c...