Thank you for the reply and for the link to those pictures of a very beautiful Colnago bike. My pictures were not that detailed; but I think you could tell that the fork crown is 'squared' and has the 'clover' and the name 'Colnago' on it. Also the shifter wires do go under the bottom bracket. But the 'Superissimo' has quite different decals, including the model name decal on the top tube that mine does not have. One place, that I did not place-mark, on the web asserted that the head tube decal on my bike was used in the 1977 - 1978 time period. I do not have any corroborating information, so that may well not be authoritative. I think the 'voting' here has favored the bike being a late 70's 'Super'; the other possibility being a 'Mexico' of the same era. I am glad that you have taken an interest and welcome anything additional you can offer. Thank you.