Hi M.K., glad to have you here at BF. For some information on your Colnago the Classic and Vintage Forum will be the best place to start. If one of the experts there can't identify the bike they can direct you towards registries and websites they know of. If you post pictures try and show the drive side out, against a plain light/white background, some angle views, the front and rear views and the bottom bracket from below. If there is a visible, legible serial number let them know that, also. Best of luck on the identification and stick around the site when you get that information.
Bill
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Semper Fi, USMC, 1975-1977
I Can Do All Things Through Him, Who Gives Me Strength. Philippians 4:13