Recently acquired a nice vintage road bike. By all indications, it's a nicer model with lovely lug work and finishing details. I'm planning on doing a restore and repaint over the winter. To that end, I could use some assistance zeroing in on: era, country of origin and if possible model numbers.

I have a set of photos up on imgur (imgur)

What I know:

• Lugged steel frame. Look to be investment cast lugs. Simple lugs, no windows or details. Lug work is very good.
• Circle B Bianchi logo seat cluster, fork crown, and lower headtube
• Brev Campagnolo rear dropouts
• Bianchi branded fluted seatpost (26.8mm OD)
• BB is not stamped or serialized. BB shell width is 26.8mm. I has a shimano cartridge bearing leading me to think standard (non-italian) threads)
• The seat cluster does have some markings: "2 A" on drive side and "2 12" on the non-drive side.
• Seat and chain stays may be chromed. There are some paint chips. Paint doesn't appear to have adhered well. Underneath the metal is way shinier than bare chromoly steel.

Any other details that might help in zeroing in on identity of the bike? Sadly previous owner upgraded almost all components (only the seatpost looks original at this point) and the frame was repainted white with little effort made in masking. All original frame decals were either removed or are covered in paints