I have a Mondonico that I bought used around 1986. A few years back I spoke at length with Chairman Bill (formerly) of Torino about this frame, and he thought it was around 1984. It has the Columbus decal with no tubing letters on it. Based on weight (light but not extremely light) and ride quality (supple but snappy and responsive) my GUESS is that its tubing is similar to SL, or is a mix of Columbus types. One tube has the dove imprint. The others could have been lost in the building process.
So the older decal style was in limited use most likely up to 1984. I would not be surprised if Antonio Mondonico built this one out of a mix of tubes or even old tubes, and had an old Columbus decal which he attached to my frame.