You cant measure that bike center to center in the seat tube because of the diameter of the tubes, that bike is like 59 top tube? well 62 frames are like 59 top tube, besides colnago uses shorter frames. Believe the trucker dan... that colnago is like a 62 even thought doesnt looks like it. By the way in many models colnago measures center to top and that center to top is around 61 or 62.

Another detail, in the US at least, like 99% of the non racers population in the use will get a hybrid bike disguised as a road bike with a massive 5 feet top tube and with road handlebars, people ask for those circus frames so manufacturers give them that.