General Electric Theater. It was not unusual for television networks, studios or program sponsors to use either an advertising or publicity agency for distribution of publicity material. In this case, GE used the publicity firm of Strauss and Irwin for this purpose.
PD-PRE1978. 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.
This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. 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.