It could aslo be a 1989, as the World Championships take place near the end of the season, but then it should also have a Carnielli 80th anniversary decal. If there's no 80th anniversary decal then it should be 1987 or 1988.

Perhaps we can narrow down the group literally. The Chorus derailleur has a dropped, horizontal paralleogram. One of the brake arms is forked with the other arm passing through it. Neither Victory or Triomphe have these features.

If it does not have these features, then it likely Triomphe or Victory. Victory has drilled brake levers while Triomphe does not. Triomphe also has a slight flar to the top of the crankset's spider arms, just before it attachs to the chainrings, Victory has straight sided spider arms.