that's true about corrosion, i believe the tritium rolex uses is also a bit different from pam.
the color seldom fade and patina. very rarely u see a very orangy font. usually quite white or snow white even for a tdial.
Something like this?

yes bro, that's what i'm talking about. very rare u see this sort.
i've been after a 16800 matte dial with strong patina for AGES...
found one in HKG, but the price is higher than a BNIB 116610LV LOL.
is pretty crazy when u have patina+matt dial+sub case+prestine condition = SUPER PRICE