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.
No date is given on the poster, but the Aviation Gas Turbine Division was closed in 1960. Therefore, it could not have been published with an automatic, post-1977 copyright.
Because this photograph is an unoriginal reproduction of a 2D public domain work, in many jurisdictions the photograph itself is ineligible for copyright protection and can be considered in the public domain as well. In other jurisdictions, the above license should be applied. See Commons:Reuse of PD-Art photographs for more information.
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Uploaded a work by Aviation Gas Turbine Division, Westinghouse from http://postermuseum.com/products/westinghouse-j34-turbojet-engine-09 with UploadWizard