Originally Posted by
CliffordK
I don't believe Colnago used Reynolds tubing on any of their bikes, at least not any of the top end bikes.
It is likely some version of Columbus tubing, SL, SLX, or a variety of Gilco style tubing, depending on the frame.
When I saw the fade and chrome lugs, my mind presumed it was a Mondia -
AFAIK originators of that style. Especially since the OP already has one.
Forgot that Colnago started doing fades at some point in the 80s. Of course Colnago frames were Columbus.