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 (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
Uploaded a work by Autore sconosciuto forse: Charles Clyde Ebbets Rimasterizzazione: utente Dixy52 (you can contact me in italian wikipedia) from https://petterssonorg.files.wordpress.com/2013/01/rockefeller-center-1932.jpg with UploadWizard