Photo of Cliff Hall (left) and Jack Pearl from the radio program The Baron and the Bee. Pearl played the Baron and Hall, his straight man, was the Bee.
Date
NBC didn't date their release. The program aired there on radio in 1952. The modified "lightning bolt" logo was used from 1942 to circa 1955 Logo of NBC.
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.