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• Columbia didn't mark this ad as copyrighted; the Billboard copyright is not valid for the ads in the publication.
• There are no copyright marks on the full pages of the ad, as can be seen at the link above. The page is clearly an advertisement, so it is not a part of any magazine copyrights. US Copyright Office page 3-magazines are collective works (PDF).

Llicencia

This advertisement (or image from an advertisement) is in the public domain because it was published in a collective work (such as a periodical issue) in the United States between 1929 and 1977 and without a copyright notice specific to the advertisement. Unless its author has been dead for several years, it is copyrighted in jurisdictions that do not apply the rule of the shorter term for US works, 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. See this page for further explanation.