I no, it is very difficult to see the right color of the PVD on a pic.
Most of the pics I make of my watch it look Black, even next to my pam 195 it look black.
But in real it is more grey than my pam 195.
I also think that a OP6500 case is more pencil grey than a OP6502 case.
Here some OP6502 love
Cheers,
Bas.nl