there came in 1974, the Alfa Romeo 2300 (Rio); a lengthened version of the Alfetta (sedan) -WHAH! So I thought! Several people have put me on the right track here... It's in no way comparable to an Alfetta, since it's based on the good ol' 1900.

And now the strange part:
I have this information from a 1979(!) "Autovisie jaarboek". (An annual edition of cars available in the Netherlands) Which states, "in 1978(!) this car came silently into the gamma. The
odd thing was that the copyright of the instruction manual was on
"Alfa Romeo Deutschland". Reading on I learned, the German Alfa Romeo Importer saw a market for these cars, where "Alfa Romeo Italia" didn't, and had ordered some 1000 cars to be shipped from Brasil to Europe.

What then happened, I don't know . . . So please fill me in!

From heresay I learned:
Those thousand cars were parked in a dead-end railroad in a forest and stayed there for four years (which complies with the 1974-1978 discrepancy) and, before they were shipped they stood on a quay for almost a year (imagine all the salty air).... So when you bought one back in '79, it was at least 6 years old already and rotting away.