That's the Competezione model, which was 2nd from the top of the line during the ealry 1970s bicycle boom. It uses the same Columbus SL/SP frame as the top, Record Professional, model. The patent date on the Campagnolo Nuovo Record rear derailleur indcates a circa 1972-1973 model. The serial number, which should be located at the top of the seat tube, may allow us to narropw that down.