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.
Uploaded a work by Plastichrome by natural color company, Inc., Boston 30, Mass., U.S.A., published by The Saconesset Homestead, Color by Charles E. Spooner from postcard with UploadWizard