English: Lobby card for the American comedy film The Hottentot (1929).
The item has no copyright markings on it as can be seen in the links above. At lower left is Country of Origin USA. There are two cards shown in the link. This is the top one. Both have Country of Origin USA at lower left; the mark is not as clear on the top card as it is on the bottom one. The bottom card has more damage to it, so it's provided for reference re: easier to read mark.
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.