You should change the saddle and bars back.
Looks like a decent bike, but as said above, I don't think Campagnolo ever made bikes. As for whether it was a show bike to show off their parts or not, I don't know how you could find out. It does seem unlikely that they would have such a small frame made for a show bike.
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1964 JRJ (Bob Jackson), 1973 Wes Mason, 1974 Raleigh Gran Sport, 1986 Schwinn High Sierra, 2000ish Colian (Colin Laing), 2011 Dick Chafe, 2013 Velo Orange Pass Hunter