The ad appeared in the 3 March 1973 issue of Billboard and can be dated from that publication; it is pre-1978.
There are no copyright markings as can be seen at the full view link.
The ad is not covered by any copyrights for Billboard.
The copyright for Billboard magazine would not affect the publicity photo's copyright status as United Artists Records published the photo on Billboard with no copyright notice.
"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."
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.
=={{int:filedesc}}== {{Information |description={{en|1=Publicity ad of Electric Light Orchestra, March 1973}} |date=1973-03-03 |source=''[[Billboard (magazine)]]''[https://books.google.com/books?id=nUUEAAAAMBAJ&pg=PA13&dq=roy wood electric light orches...
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