The tubing decal remnants are that of a Bianchi Special by Columbus decal, which makes it a 1985 model, while the Shimano New 600EX components make it a Bianchi Limited model. So, you have a 1985 Bianchi Limited.
Edit: Mid-range model, 9th in a 16 model road line. $520 US MSRP.
Last edited by T-Mar; 12-24-21 at 04:45 PM.