I recently acquired a 1984 Colnago Master MTB in nearly unridden condition from someone in Colorado who found it in a house he bought. It is a lugged steel frame of Columbus tubing. The top and down tubes are of the same 4 sided shape as the Master road bikes of the same era. It has a long wheelbase, relaxed 70 degree seat tube geometry, rigid steel fork with stamped "C" crowns, oddly shaped Ambrosio Aero rims. Running gear is Shimano XT 6 speed indexed. It weighs a ton! I can't locate a serial number anywhere, but many older Colnagos don't have serial numbers at all. It got a lot of attention at Sea Otter last week. No one I have spoken to knows anything about early Colnago MTBs. Does anyone out in Cyberspace have any information about this bike?