To clarify the racing frames Bianchi made in the mid- to late 1980s (my info dates from 1987-90):
1. Mass-produced Columbus "Special Bianchi" CroMoly tubing, same wall thicknesses as SL. This was quite inexpensive (about 2/3 of an SL Reparto Corse frame with similar tubing). No chrome, if I remember correctly. The frame on e-bay looks like that one.
2. Then there were two "Reparto Corse" frames. These were handbuilt production frames, but quality was variable. One came with SL, the other SLX. The SLX frame had more investment cast pieces (brake bridge, etc.). Both features a chromed fork crown, dropouts with a few inches of fork legs and stays, etc. The stickers clearly said "Reparto Corse." That said, the stickers tend to come off.
The Reparto Corse frames were almost all Celeste. In 1988, quality went really downhill - I bought a 1987 frame in 1988 in Germany, and the dealer had stopped carrying the frames. I later saw a 1989 frame in Texas that was just awful.
Jan Heine, Seattle