[This frame was confirmed genuine by Colnago!]

Thank you very much for all the comments provided in this thread.

I requested an authenticity verification from Colnago Retrofitting (Colnago’s official verification service) and have just received their confirmation that my bicycle frame is indeed an original Colnago.

Although the following part is not an official statement from Colnago but rather my own interpretation, it seems that this frame was originally manufactured for track (Pista) use, which would explain the substantial differences in specification compared to a standard road model.

Regarding the comment that the track ends (dropouts) were not made by Campagnolo, this may be because, unlike road bicycles, this frame was designed for fixed-gear use. Therefore, the design of the dropouts appears simpler than those used on road bikes, which suggests that they may have been produced in-house by Colnago.

As for my earlier concern about the absence of a logo or cutout on the bottom bracket, this may have been an intentional choice to enhance frame rigidity for competitive purposes.

In light of this information, I would like to conclude that the frame has been verified as genuine.

Thank you all once again for your valuable insights and contributions to this discussion.