Boy, that stem looks high. Scary high actually. As to its place in the Colnago world, the images are without much detail. Even early Mexicos had Colnago Mexico on the chainstays. Even if it is a Super it may be built with SL tubing. It is missing its tubing sticker or transfer, both were fragile. My guess is that there is only a Club on the fork crown, couple that with the top tube guides and it points to 1975+/-, it is hard to tell if it is original paint. Pantographing on the brake levers is fun.