I'm renewing my efforts to find this film - "Waiting for Godot" from 1961 starring Burgess Meredith and Zero Mostel as Vladimir and Estragon respectively. Kurt Kazsnar played Pozzo.

I believe it aired as part of the "Play of the Week" series in the early sixties and was available for a brief time on home video in the late seventies and early eighties. The tapes are now out of print and a dog to find.

The usual line axiom applies: "if anyone has a copy, please get in touch. I have much to trade".