I've been studying the pics a bit more and the components appear to be the New Shimano 600EX group with indexed shifters, which should place things 1986-1987. But it doesn't have the the World Championship decal, so unless it's been removed, like the model decal, that should make it a 1986. In which case it's not a Trofeo. I couldn't find the 600 shod model for 1986, but in 1985 and 1987 it was the Limited, so there's a good chance that is what you have. Some Limited were made in Japan, but we've also seen Italian manufactured versions.
Of course, pics and the serial number are still required to confirm my guess. Then again, maybe I'm out in left field.