Bit of a hodgepodge of components, I would guess that the hubs (and thus the wheels) are non-original. Does it look anything like this;
http://www.puncheur.net/roubaix/?p=1

Campagnolo Nuovo GS was made from 1974-1985 so that somewhat helps bracket the possible age if those parts are original. The Modolo and Ofmega parts (if original) probably point more toward 80's.