Originally Posted by T-Mar

I never trust decals on a Bianchi, as it is arguably the most popular brand to "flip". Consequently, to maximize the return on investment, there are a lot of replacement decal sets and even repaints. There are a lot of "flippers" who choose decal sets based on their personal preference or cost and not necessarily what is era correct. They tend to prey on the "newbies" who want a celeste Bianchi at any cost.

Bianchi didn't introduce SBX until after they introduced their Superset II frame configuration in 1991. Superset II frames are easily identified by their down tube, which is slightly oversized and takes on an oval shape at the bottom bracket. To ensure it's SBX you also have to look inside the BB shell for the five helical ridges at the ends of the doen tube, seat tube and chain stays. To the best of my knowledge, the SBX frames were built to standardized geometry.

Rather than "keep it simple", my take on the cosmetic evolution of the Bianchi racing frames has been "keep it inexpensive". In the early to mid-1980s there was lots of embossing, In the late 1980s the embossing started to be replaced with decals. In the 1990s even that disappeared. This was probably to offset the technological frame developments, first with Superset, then with Superset II. Bianchi was big into the development of eponymous tubesets with Columbus, such as Bianchi Special, Formula One , Formula Two and SBX. The frames were advancing technologically but the cosmetics were getting more plain.