Batten, Barten, Durstine & Osborn, the long-time advertising agency for the show's sponsor, Campbell's. It was not unusual in the 1950s and 1960s to find a network, studio or show sponsor using either a publicity or advertising agency to distribute promotional material.
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.