An early Colnago Super is my guess.

Probably is a re-paint, not only because Celeste green is a Bianchi mainstay, not Colnago's, but because I believe their should be chrome fork caps. I ride a 78 Super, and IMHO, it is the best riding bike I've ever been on. It does everything so well. Put some Campy brakes on her and enjoy the ride!