I have one, but have no idea what year it is.
It's a gray Bianchi with pale grey Bianchi decals. It has Made in Italy and Foderi Forcella Special Columbus stickers. Campagnolo front and rear derailleur. Modolo breaks Miche wheels and Bianchi crankset. The frame is a 54cm. It has a B stamped on both sides, under the saddle (you know, at the joint of the seat tube... Sorry for my bad english) I live in Canada.
The serial is just over the front Bianchi decal. It's 2C 06971.
I hope it will help you in your attemps to break the serial code and if you have time to give me any information you could have on this bike, it would be much apreciated.
If you need pictures of the bike, I'll try to take a few.
Thank you,
Lëa