Originally Posted by T-Mar

That Tioga T-Bone is a road stem and non-OEM. T-Bone were popular aftermarket items, though they were also spec'd as OEM by some bicycle brands. They came in both road and ATB versions. Had this been an ATB version, it would almost certainly have had some noticeable rise to it, rather than being horizontal. The ATB versions also typically had a built in guide for cantilever brake cables.

Regarding Quattro, the more plausible story, at least in my mind, is that Bianchi wanted a homogenous group (at least in name), as that had become the market trend at the time. Shimano had successfully trickled the group concept down to entry level range with the introduction of their Exage groups in 1988, convincing the consumer that components designed to function together, did work better.

Bianchi's prior approach to the Cd'I was a mix of 2nd tier of European components (Modolo, Gipiemme, Ofmega, Stronglight) with SunTour derailleurs but the average consumer thought it looked too much like it was thrown together from a backyard mechanic's parts bin. All these component manufacturers were hurting from Shimano groups taking big chunks out of their market share, so I don't think it took too much pressure from Bianchi too convince them to market them under a single Quattro name, to try to give the impression of a single sourced, harmonious group, like Shimano was offering.