pretty sure that's an aluminum frame.
check it out for cracks around the joints, cracks in the paint. Just make sure it's solid. 90s is a long time.

If it's "perfect", would be really cool though. I like those paintjobs, and you can get props from the geritol, cafe run, beer belly, ***** tit crowd 'cause you run a Colnago.

Real Colnagos all have a rider painted on the top tube and has Ernesto's signature. There are a lot of knockoffs. Bike sponsor told me that once, always remembered it.

SST is a great bike but definitely more race/competitive riding focused.