At some point in the '80s I typeset the blinken light doohickie from a photocopied sheet that I somehow acquired. Since I don't have the original galley, I don't know (from my header) when exactly or on which equipment (but probably Varityper CompEdit rather than Varityper 6400 or Compugraphic). Knowing which equipment (and the font number) would help date it by where I was working at the time.
I just ran across a copy photocopied from that galley when I was going through a box of old humor recently. (Yeah, I'm German and compulsive and save and archive that sort of thing -- and a lot of other sorts of things.)
I vaguely remember, though, seeing it earlier than that, but can't remember when exactly.