Here’s a really great example of the accent that was quite prevalent from the 1970s until the mid-1990s.

I could write a lot about exactly what distinguishes that very peculiar (yet extremely common at the time) accent, but listen to the very distinct consonant enunciation and the flat, very wide, almost-monotonal vowels with the syllable stresses nearly rounded off. The first and last word of a phrase is almost always emphasized as well, which is part of what makes it very distinctive.

So glad I was able to find such a clear, short example of that (so far as I know) unnamed accent that has completely disappeared now.