What year was this counting skit made?

[Stupendous Man]

While viewing my copy of SS Unpaved #1800 which I got from Splurge last summer, I saw a sketch that puzzled me. It had David, Luis and Linda standing together in front of a music stand. David said, "One." Luis said, "Uno," and Linda held up one finger. All three of them counted until they got up to 10. I am wondering when this sketch was made because Linda looked very young, and had a different hair style. Also, I could tell it was made before 1973 because of the quality of the camera image. I remember hearing that Linda had been with the show since April 1971, but did not become a full-time character until 1977 (supposedly on episode #1056). Anybody know what year CTW/SW produced this skit? Thanks!

 

[mikebennidict]

late 70s as i recall it.