The most important decal is "Reparto Corse" on the seat tube. It means racing department, although what that meant by the - then - manufacturers of Coppi, I guess no one knows.
Based on the age of your bike, the layout with the carbon forks and monostay was not uncommon, but back then also not every "niemand" made such a thing, Colnago, Bianchi, etc most had such a bike, but not the chinese cheapos yet. IIRC the Masciaghi ones had a "by Masciagi" decal on them.

EDIT: Anyway, it seems., according to the official "COPPI" page (yeah, no Fausto) that its still Masciaghi, but they are now owned by another entity - some investment firm I guess - PE Industrial - since 2023:
https://bicicoppi.it/en/company/

So, however it happened, Masciaghi can be nailed down, since your bike was definitely, not made by the OG Coppi Makers Fiorelli