Interesting bike.

Nice decal work. Rust is visible under the decals in a few spots. And, I think a seam along the bottom of the downtube. Probably other tubes too.

Seatpost is Campagnolo (marked near the top front). I presume it is a Nuovo Record that has been machined. One can tell by the seat rail mounts and bolts on top (not visible in the photos).

I presume the frame is from the mid 70's.

By the mid to late 80's, several brands including Colnago were experimenting with aluminum and steel lugged carbon frames.

For example, Giant CADEX



And, the Colnago made the "Carbitubo"



Note, the lugs with lugged carbon don't have the sharp points and other details that the steel bikes had.

That is the reason for the aluminum-like paint on yours, and in many places masking straight across the tips of the lugs, rather than following contours.