1990 or 1991 Bianchi Specialissima X4 TSX

There are several points we have to discuss about this bike.

Firstly, when was it made?
Secondly, why it's assembled with these components?

Do you have any informations?

We thought this bike was made in 1988, but thanks to Robert@Velo Aficionado&HIPSHOTS CORPORATE PHOTOGRAPHY, it turned out to have made in 1990 or 1991.