Columbus Aelle models were middle 90's. Dedacciai CrMo models were later from 1997-2001; they have bi-oval top and down tubes, internal rear brake routing and fastback stays, were as Aelle models were completely round tubes. They also made them in Columbus Gara which were round-tubed.
Mine was Dedacciai CrMo and looks similar to yours. Lugs and fastback stays look identical. I had it powdercoated and went with earlier 80's decals. Mine was 1999 model year, bought NOS in 2003.