The situation is complicated. The easy cases:
- In the United States, it's in the public domain for lack of a copyright notice.
- In countries that are parties to neither the Berne Convention nor the TRIPS Agreement, it's in the public domain because those countries don't recognize anyone else's copyrights.
- In countries that have adopted the rule of the shorter term, it is in the public domain because the image was never copyrighted in the country of origin.
In the remaining countries, it is likely but not certain that the photo is in the public domain. Article 18 of the Berne Convention provides that:
(1) This Convention shall apply to all works which, at the moment of its coming into force, have not yet fallen into the public domain in the country of origin through the expiry of the term of protection.
(4) The preceding provisions shall also apply in the case of new accessions to the Union...
So in theory, since it was in the public domain in the United States as of March 1, 1989 (the date the United States ratified the Berne Convention), it's in the public domain in all Berne countries. However, not all countries may have implemented Article 18 exactly as written.