I recently acquired a Bianchi steel road frame (Dedacciai Zero tubing) that was purchased in Italy with serial number E1809. The only other number is on one of the rear drop outs which is stamped T116. The paint is pearl Celeste and it utilizes internal routing and a braze-on front derailleur. The previous owner used the term “Concept” as if that was the particular model bike. I imagine it is a late 1990’s Bianchi but don’t know the particular model. It could easily have originally been a “frame only” purchase. Images are in my profile album Bianchi Megaset Concept. Any additional information would be appreciated.