ABC Television. During the 1950s and 1960s, television networks, studios and program sponsors sometimes used advertising or publicity agencies to distribute publicity material. In this case, the Bureau of Industrial Service, which was a division of advertising agency Young & Rubicam, was used for photo and press release distribution.
Note that the marks on the back of the photo are not copyright marks, but either photographers' or collectors' marks. Have shown them right side up for clarification.
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.