The item has no copyright markings on it as can be seen in the links above. At bottom left is "C" (for poster version "C"), Litho in USA and #3893 which probably pertains to the printing of the poster. At bottom right is Tooker Litho Co. NY-they printed the poster.
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 film ''Blackmail.''. |Source=[http://www.ebay.com/itm/BLACKMAIL-EDWARD-G-ROBINSON-RUTH-HUSSEY-1939-1-SHEET-/321716233640?pt=LH_DefaultDomain_0&hash=item4ae7c825a8 eBay] [http://www.filmposters.com/images/e...
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