Do a search on Columbus Brain tubing; De Rosa Brain tubing, and that will help you date the bike. Brain is from the early to mid 90’s I believe. In my mind I recall Genius was the higher end Columbus from that time and Brain a notch below. That’s a good looking bike and I bet it will make for a nice rider. I’d replace the ugly stem and hang some nicer parts and wheels on it.
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N = '96 Colnago C40, '04 Wilier Alpe D'Huez, '10 Colnago EPS, '85 Merckx Pro, '89 Merckx Century, '86 Tommasini Professional, '04 Teschner Aero FX Pro, '05 Alan Carbon Cross, '86 De Rosa Professional, '95 Gios Compact Pro, '95 Carrera Zeus, ‘81 Masi Gran Criterium, ‘81 Merckx Pro, ‘89 Cinelli Supercorsa, ‘83 Bianchi Specialissima, ‘VO Randonneur, Ritchey Breakaway Steel, Rivendell Rambouillet, Heron Randonneur, ‘92 Ciöcc Columbus EL