Pre-1978 no mark. There are no copyright marks. At lower left is Country of origin USA. At lower right is the Morgan Litho Co. logo-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 1928 film ''Red Hot Speed''. |Source=[https://movieposters.ha.com/itm/comedy/red-hot-speed-universal-1929-/a/613-29102.s?ic4=GalleryView-Thumbnail-071515# source] |Date=[http://www.imdb.com/title/tt0020316/?ref...