The US Pantera was sold up to the '74 model year with non-rated tires.
Even if sold new in Europe, I know of no tires with ratings on them at the time.
Are you saying that ALL Panteras now in Europe are pre-determined to have a specific speed capability and as such are REQUIRED by the State to have tires rated to that capability?
As far as "Giorgio" getting out of your way, color me skeptical on that based upon how I have seen drivers in Rome. That's every "man" for himself? Seems more like a demolition derby to me?