“this version was broadcast in the 1990s”
The quality of the recording sure didn’t sound like it was from the 90s to me.
For all we know, this particular recording was someone holding a microcasette voice recorder up to his radio. But I do know this broadcast is from the 90s, not the 60s. Harvey gave a couple versions of this over his decades in radio, and he is in his 70s there, not is 40s.