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From the US Copyright Office Circular 3, Page 3, Contributions to Collective Works. (A magazine is a "collective work".)
A notice for the collective work will not serve as the notice for advertisements inserted on behalf of persons other than the copyright owner of the collective work. These advertisements should each bear a separate notice in the name of the copyright owner of the advertisement.
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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.
This tag is designed for use where there may be a need to assert that any enhancements (eg brightness, contrast, colour-matching, sharpening) are in themselves insufficiently creative to generate a new copyright. It can be used where it is unknown whether any enhancements have been made, as well as when the enhancements are clear but insufficient. For known raw unenhanced scans you can use an appropriate {{PD-old}} tag instead. For usage, see Commons:When to use the PD-scan tag.
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== {{int:filedesc}} == {{Information |Description=Two-page advertisement for en:Television News Inc. |Source=Scanned from [https://archive.org/details/sim_television-radio-age_1973-10-01_21_5/page/n32/ page 32/33] of the October 1973 issue of ''Radio Age'' magazine |Date=1973-10 |Author=en:Television News Inc. |Permission=This advertisement did not have a copyright notice and is in the public domain. From the US Copyright Office [http://www.copyright.gov/circs/c...