Arnold, I agree, I do remember seeing it on what I think was the PWB 4.0 tape. IMHO: it was before cshell, termcap, vi et al was released inside of the rest of the Bell System and there seemed to be sometimes "SW from BSD be bad/crude" 'tude. IIRC ber and mmp must have had it running on the Marx's brothers systems in Whippany. But he had vi, so I personally never used it.
@Mary Ann - this would have been around the time you were in Columbus and starting the terminfo work. Do you have any memories?