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@chris_gee
Late 1980s
Just curious...why do you think this group is not original? The 6400 group Shimano described as "...Ultegra... features polished bearing races, high strength steels, a striking modern colour treatment and compact high-tech design theme" and a suitable choice for a 'superissima' :)
The bottom bracket is Ultegra also, and being a loose bearing type, ( and it needed much encouragement to be removed! ) leads me to believe it was original group.
But whatever the case, you may have the frame built to your own specifications, or just buy the frame and source the parts you prefer.
Thanks again!