G'day,
i can think of two:
The 1815 Moonphase was available in Platinum with a black dial (reference 231.035):
The 1815 "Side Step" did come in Platinum as well (reference 222.049, edition of 50 units in 2003):
There may have been others, be it as a limited edition or production. But i´m in hope others can help out in this regard 
Another chance to see a black dial/Pt case piece might have been "stealthening"; the black or dark blue dials appear to come with white gold cases in first degree and it might have been possible to custom-order a conversion from a "Pt dial" to "WG dial".
Greetings from Germany,
Peter