Barrie Craig, Confidential Investigator
Running from 1951 through 1955, Barrie Craig, Confidential Investigator is about a New York private eye of the classic B-movie variety.
William Gargan plays the title role with the required deadpan delivery. He rarely gets flustered, even in life-threatening situations.
You can find more episodes in the Ear Benders section.
Here is a sample of the online episodes currently available at The Old Time Radio Fan: