It's not a Judge only color, but it is very uncommon to see it on a regular GTO. I've only found 1 in the last 10 years or so.
('70 GTO 455 4spd)
It's kind of like the Carousel Red color for '69 Judges. It was mostly a Judge color and very rare to see it on a regular GTO.
The last couple of years I started to count the different colors of documented Judges that I've come across. I counted your car too.
