Pre-1978 no mark. Warner didn't mark the ad as copyrighted; the Exhibitors' Trade Review copyrights before expiration did not apply to the ad. There are no copyright marks on the ad.
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This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. 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=Scene from the 1926 film ''The Sea Beast''. The scene is seen on the linked ad for the film. |Source=[http://archive.org/stream/exhibitorstrade00new#page/n197/mode/2up Exhibitors Trade Review] [http://archive.org/stream/exhib...