|This isn't my image, but rather came from this great website|
I am fairly certain by 1980 (I estimate 1979 to actually be the turn-around) these bikes were definitively second from the top behind the Specialissima. At this point, they were straight-gauge chromoloy frames with a single settle of water bottle bosses and a fluted seat post. The reason I think they may have stepped down to second in the hierarchy at this point is because they were now straight gauged, instead of the V-GT Luxe they now featered V-GT rear derailleurs, and instead of bar-end shifters, they now featured down-tube shifters. Other than that, they were almost exactly the same with the
Though not a major change, I will note that in 1981 (at the very least), Univega made several bikes in a unique orange color
The next major change seems to have been in 1982 when the Gran Turismo got cantilever brakes and upgraded to the Suntour BL (blue line) front and rear derailleur. Additionally, a second set of water bottle bosses were added along with rear-rack braze-ons. This year also seems to feature a wonderful brazed-on slap guard. At this point the frame was double-butted as well.
By 1987 the Gran Turismo was replaced by the Gran Touring and was no longer manufactured in Japan, but instead in Taiwan.