Hi folks, just scored this cool Colnago, which I had never heard of til I found it at a garage sale. From my research, looks like it might be a mid 80s Nuevo Mexico, but I'm not sure. It's got mostly Shimano 600 components-cranks,rear derailleur, shift levers, brakes. Headset, rear dropouts and front derailleur are Campy. Can't find a serial number anywhere. Drive side chainstay only is chrome, as is fork. Handlebars and stem are Cinelli. What do you folks think as to model and year. Any help appreciated