Another favorite is Sherlock Holmes, the best ones staring Basil Rathbone & Nigel Bruce, who are most widely recognized for starring roles in fourteen Sherlock Holmes movies between 1939 and 1946. Rathbone and Bruce also reprised their film roles in a radio series, The New Adventures of Sherlock Holmes (1939–1946).
Here from 1945 are three excellent episodes, complete with "Petri Wine" commercials.
Sherlock Holmes - 1945-11-05 - The Gunpowder Plot
Sherlock Holmes - 1945-05-21 - The Paradol Chamber
Sherlock Holmes - 1945-10-08 - The Vanishing Elephant