The existence of genuine, 3-color 6239 ROC (Rolex Oyster Cosmograph) dials have been debated for many years. I have seen a couple on TZ owned by credible collectors, but there are other collectors, who are just as credible, who deny they exist. But, unless you intend to wear it to a Rolex GTG or post pics on a gen site, I would not worry about it.
Of course, there is no such controversy regarding the non-Oyster version, so I wear mine (mostly) worry-free