Are you sure that's an '89? I just bought a 1984 Univega Gran Premio with those same type "aero-style" shifters. Love the look of 'em, and people say they're the finest friction levers ever built, I'm hoping so.
But friction shifting ought to place the bike's year of manufacture no later than '85 or '86. Post 1986, I don't think you buy anything new that didn't have friction shifting.
Nice score, BTW. Congrats. I would not have been able to resist that ride at that price either.