I think someone had previously posted this advertisement showing the lineup.
The Countach is where they mention pinned construction, so its possible thats the level (and above) where Mondonico was builder.
The Mondonico bottom bracket stamping is unique and easy to spot, with a tall “M” in the middle.
I have a Nitro Express in EL-OS, and every time I ride it I re-affirm that it is my best ride!