Well here's a period brochure shot of the Super frame. I assume your frame is a Super, with those chrome lugs (although other members may have better knowledge). Mexico's had the indented tubes, Arabesque's the fancy lugs.
The original easy spec? I think your colour scheme is that of Freddy Maertens and the Sunair team in '81:http://montour1959lasuite.blogspot.co.u ... -1981.html
Also some East German amateurs rode blue ones around that time - a search for Uwe Raab might turn up some examples.
Spec at the time would most likely have been either Campagnolo Nuovo or Super Record, probably 3TTT bars and stem (probably a model 78 stem), rims may have been Nisi or Ambrosio (there are some Colnago branded Ambrosios out on ebay), saddle - Saronni made the the Concor look `right' on Colnagos from about '82.
Colnago liked to pantograph it's components and brand toeclips / straps even saddles. There are a few rebadged 3TTT saddles out there if you look for them.
Be careful though - Colnago parts are highly collectable and therefore expensive. I fancied a NOS 3TTT pantographed stem for mine recently, but it sold for £300!