There are no copyright markings pertaining to the image as can be seen in the links above. At bottom of the uncropped poster is Globe Litho Co. NYC and Litho in USA.
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 1939 re-release of the Bing Crosby film ''Sing, Bing Sing''. |Source=[http://www.ebay.com/itm/Bing-Crosby-Vintage-Stock-One-Sheet-Movie-Poster-R-1939-Atlantic-Pictures-/191386637489?pt=LH_DefaultDomain_0&hash=i...