I just picked up an older Bianchi and fixed it up for my beater bike. The frame was repainted an ugly green and the only ID is the serial number, which may or may not tell me anything if I feel like pulling off the BB housing cable stays to see it. It's a very light lugged steel frame, Shimano 600 cranks, 50/39 double, 105 group w downtube shifters, 8 speed cassette, quill stem, TTT bars, dura ace hubs on Mavic Open Pros.
I don't know if any of that is original, but I put the bike as a late 80s or early 90s model. Closest match I found for the frame browsing around was an 85 Limited. Any ideas?