English: Poster for the 1936 film Oh, Susanna!. There are no copyright marks on the item, which can be seen at the link. At bottom left is Country of origin USA. At bottom right is Morgan Litho Corp, Cleveland, O.--they printed the poster-and 9566-probably connected with the printing of the poster.
This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. 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.