This Colnago classic steel frame set is once again one of those, which don't fit in any model categories. Despite being a very nice and indeed interesting piece, we cannot call it a Super, Nuovo Mexico or anything else. It is a special and customized piece.
We can certainly find some similarities with Colnago Nuovo Mexico as they share the same bottom bracket shell, ovalized seat stays with the same caps and chain stays with long shallow crimps. But that's where the similarities end. The frame is probably made of Columbus SL tubes, the brake cable is routed internally and the Colnago rear dropouts have a specific rounded shape.
Rear axle width: 126 mm
Steerer length: 145 mm (threaded part: 34 mm)
Bottom bracket: ITA
Seatpost diameter: 27.2 mm
Front derailleur attachment: braze on