Time ago I bought this Falaschi, because it was different like other bikes. It has profil top tube like Colnago Super profil 1.version. After searching on the Internet I found the name of Carlo Falaschi who is Ernesto Colnago friend and his reseller of Colnago bikes. The frame has engraved in the rear right drop out a nuber like have most of Colnagos in that era, but I can't say that was made by Colnago or that the tubes and other material is from Colnago factory. I don't have enough information, but for me is very nice frame. The size of seat tube is 27mm and the fork inside the steerer seems like Columbus Slx, maybe is not original.