1. The symbol © (letter C in a circle); the word “Copyright”; or the abbreviation “Copr.”
2. "The year of first publication. If the work is a derivative work or a compilation incorporating previously published material, the year date of first publication of the derivative work or compilation is sufficient. Examples of derivative works are translations or dramatizations; an example of a compilation is an anthology. The year may be omitted when a pictorial, graphic, or sculptural work, with accompanying textual matter, if any, is reproduced in or on greeting cards, postcards, stationery, jewelry, dolls, toys, or useful articles."

   This was not required for copyrighted photos published before 1978 under Copyright Act 1909, and omission of date may have been irrelevant to such works. However, Copyright Act of 1976 came into effect and then has applied to copyrighted materials published before 1978. Year has become required for works published before 1978. Consequently, pre-1973 copyrighted photos without a year of copyright and registration and required mandatory deposit into the Copyright Office lost copyright protection and then fell already into the public domain.

3. The name of the copyright owner, an abbreviation by which the name can be recognized, or a generally known alternative designation of owner.

   Example © 2007 Jane Doe.

Publicity photos (star headshots) have traditionally not been copyrighted. Since they are disseminated to the public, they are generally considered public domain, and therefore clearance by the studio that produced them is not necessary.

The Professional Photographer's Legal Handbook By Nancy E. Wolff, Allworth Communications, 2007, p. 55:

There is a vast body of photographs, including but not limited to publicity stills, that have no notice as to who may have created them.

Creative Clearance-Publicity photos"

Publicity Photos (star headshots) older publicity stills have usually not been copyrighted and since they have been disseminated to the public, they are generally considered public domain and therefore there is no necessity to clear them with the studio that produced them (if you can even determine who did).

Copyright in a work created before January 1, 1978, but not theretofore in the public domain or copyrighted, subsists from January 1, 1978, and endures for the term [of either 70 p.m.a., 95 years (if for hire, anonymous, or psudonymous), or 120 years from creation]. In no case, however, shall the term of copyright in such a work expire before December 31, 2002; and, if the work is published on or before December 31, 2002, the term of copyright shall not expire before December 31, 2047.[1]

Nevertheless, We hope said in his E-mail to me:

Saw that the file for Pricilla Morrill is really a PD file; if you look at the stamp Field Enterprises applied when they received the photo and press release, it's January 1975.

They kept the photo in their files and didn't use it until December 1994 (the Sunday Dec. 4, 1994 stamp on it). The first publication would be considered to be the one in 1975, when CBS distributed the photos and press releases, not when the newspaper or television station decided to use the photo in their work. I don't see any mention of a copyright for the photo on either side of it, nor on the press release.

This would free up the entire photo for anyone who might want to use it for either the Mary Tyler Moore Show or character Lou Grant.

To be honest, I could not tell the difference between "publishing" and "printing" in terms of copyright. CBS has printed and then distributed bunch of copies to the press out of trust. Its Press Division has rights to publish this photo for its own works, such as advertisements, and to grant permissions to periodicals to reproduce it. No known pre-1978 works are known at this time; nevertheless, until then, this photo must be treated as qualified for Commons.