If you use ROKU to stream, you can access some surviving shows from the long-defunct Dumont TV network which aired a diverse amount of programming from 1946 to 1956. There's now an app that can be added that is comprised entirely of old Dumont programming, replete with the old commercials.

Dumont reputedly was particularly strong cranking out crime dramas with significant elements of noir. Sadly, much of Dumont's output of 22,000 episodes titles no longer exists. The bulk of the film library was literally dumped in the East River when the network folded, but a smattering of its programming survived.

Worth noting on the Dumont app:

The Adventures of Ellery Queen (eight episodes)

The Cases of Eddie Drake (3 episodes)

Follow That Man (15 episodes of Ralph Bellamy playing against usual type as a hard-boiled private investigator)

Front Page Detective (6 episodes of newspaper columnist solving crimes)

Rocky King, Detective (8 episodes with titles such as Death Has Dark Hands, Murder Scores A Knockout, One Minute For Murder, Murder PhD and Detective Dies At Midnight)

Public Prosecutor (6 episodes, self-explanatory)

I'm sure Gord is aware of some of these and may possess some in his vast collection. The production values are pretty primitive and the scripts hit/miss but I've found a good deal of it worth a look.