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.
The item has no copyright markings on it as can be seen in the links above. At bottom right is a logo for the Tooker company--they printed the poster--and at bottom left is Litho in USA and some numbers which appear to refer to the print job of the poster.
Captions
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{{Information |Description=Poster for the 1927 film ''A Day at the Races''. |Source=[http://www.impawards.com/1937/day_at_the_races_ver3.html site] [http://www.impawards.com/1937/day_at_the_races_ver3_xlg.html poster] |Date=[http://www.imdb.com/title/t...