A search for copyright renewal was done in artwork for the years 1973 and 1974. There were no listings for International News Service or its successor company Associated Press.
The auction photos were originally hosted on a site which does not allow robots re: archiving. Copies are provided at the links.
There's no evidence of continuing copyright for the photo.
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 (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.