I was pretty young then, but think I recall his gun being a Chief Special. Don't know if they ever showed whether it had a round or square butt.
I'll check You Tube for episodes. They have a lot of old TV shows and some excellent wildlife programs from National Geog., etc.
I used to know all the guns carried by TV private eyes and cops.
The New Orleans PI's on Bourbon Street Beat had snub .38's, but kept a .357 Magnum in the office for heavy needs. I think it had a 3.5-inch barrel. I already thought that Elmer Keith was right and that N-frame S&W's should have min. four-inch barrels.
I wasn't especially taken with Lola Albright. She seemed a little much, like Marilyn Monroe. My favorites were Vena Ray from, Rocky Jones, Space Ranger and a couple of Mouseketeers and Playmates Carol Eden and Ellen Stratton. Miss Dec., 1959. I used to read my uncle's Playboys when I visited him in Tulsa. I was about 14 then. My fantasy women have always tended to be Playmates or VS models, not actresses. There have been exceptions, and some overlap, like with Stella Stevens, Erika Eleniak, and Victoria Vetri. But in hindsight, Lola was good for her role on, Peter Gunn, and I liked Craig Stevens as the hero. He seemed more sophisticated and intelligent than most in similar roles.
Of the sultry siren types, Julie London probably appealed to me the most.