• The photo has no visible copyright markings, because it's concealed by a signed slip from the actor's autograph w/ a date verifying 70+ years, as can be seen in the link above; however, in the other copy of the file showing the production companies and description below the photo, it states that the copyright is waived so that cinemas may promote publicity, and its use in newspapers, magazines, and other periodicals, for the same intended purpose that the public domain motto eschews; uploaded separately (as was done in the eBay source link above).
• See also w:film still article, which explains that publicity photos were traditionally not copyrighted.
• Unsure if copyright is a registered/expired one of 70+ years, or if simply null and void due to the waiver.
• It was created for publicity purposes-distribution to the media and the image was meant to bring attention and publicity for actors and actresses. See also w:film still article.

Film production expert Eve Light Honathaner in The Complete Film Production Handbook, (Focal Press, 2001 p. 211.):

"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."

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

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)."

• United States Copyright Office page 2 "Visually Perceptible Copies The notice for visually perceptible copies should contain all three elements described below. They should appear together or in close proximity on the copies.

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.

3 The name of the copyright owner, an abbreviation by which the name can be recognized, or a generally known alternative designation of owner.1 Example © 2007 Jane Doe."