Ok, I just checked
www.cyclomondo for red lettered decal kits and Greg Softely has one listed for mid-70s Colnago's. I still think it's a Super. Here is my later model '77 with a replacement decal kit I applied last July. I hope the bike fits you well because you have a beauty and there arent too many of these classic racers around anymore. Keep it if you can.
Here is my restored '77 Super:
