Would $ale have been the first to use a fully-CG clock (the Helvetica or Futura)? Off the top of my head, it seems that, even by 1985, a lot of shows superimposed a vane display, with a few Goodson-Todman shows using eggcrates (Cullen's Blockbusters, Dawson's Feud, the first week or two of Body Language). Maybe Every Second Counts? (Never mind. That was an actual tote display wired as a clock.)
I take it the Scrabble Sprint clock used a technology similar to what Nicholas explained, if not the exact same technology, except with a stopwatch-style clock?