Scooper, here is all the additional stuff I could l find.

The main label listed in the original post also says "Over Size" (Over on one side and Size on the other with the Columbus decal in the middle). I somehow missed that.

The fork says
Columbus
Foderi
Rinforzati
Custom

The Chain Stay says
Costructa
Nel
Reparto
Corse ... (my cadence sensor could be moved to see the rest if it matters. I'd guess maybe two more letters)

The Head Tube has Eduardo Bianchi. And there 'Bianchi' and some 'B' s scattered about (also Made in Italy). The top tube has what would appear to be a script signature, but it is totally illegible.

Thanks again for the help.

FWIW, this is really about trying to understand what I own. And I am coming from a position of 'extreme ignorance' (at least on a relative basis) regarding bicycle construction and technology.

dave