Definitely not a genuine Colnago, though it may be a "Colnago Sport". Bit of background, as far as I can remember (some of this surmise and scuttlebutt): in the 80s Colnago become too popular to keep up with demand, but still wanted to capture some of the mid-to-not-quite-high-end market. So they gave their international distributor permission to license a "Colnago Sport" brand, supplied some of the frame parts, and had those built in Finland, Mexico, and possibly Canada, except these didn't use the cloverleaf cutout in the bushings. Also, you could get these with Shimano 600 components instead of the Campagnolo-only offerings from Colnago. All in all a very nice bike, if a smidgen heavier than a Colnago Super.
Now, I do have a "Colnago Sport"/Shimano 600, inherited from an uncle, originally very probably bought in Canada, so I can compare: the decals seem to be the original silver Colnago ones, instead of the white "Colnago Sport" ones, which had the "Sport" either after or below the "Colnago" or below the cloverleaf. Otherwise, in the first image, this looks like mine, including the fork, except for the newer brakelevers. My bottom bracket looks quite different, though. A different bearing, two rectangular cutouts in the bracket tube to further save weight, overall looking more carefully machined and assembled, and only one number stamped into it, the frame height.
I'm afraid my conclusion is only a weak "maybe a Colnago Sport."