TSX ran alongside SLX for professional framesets.
Tsx had the conical spiralling along the whole tubes while SLX had it at the ends of the tubes. The difference was a slightly lighter SLX tubing with a stiff but comfortable frame while TSX, while stiff, due to the different profile of the spiralling inside the whole tube made for a more 'all day comfortable' frame.
The SLX was listed for one day and classic type raceing and the TSX was for stage raceing.
I'll try to dig up the blurb for it.
My Merckx is SLX and my Squadra was TSX, both lovely to ride.
I have now looked at the catalogue on site here and the Aquila looks the same if not even a bit classier, its in TSX from 1993 and finish looks for all purposes the same as a Squadra. Even has the number hanger.
Jamie