My understanding is that Rolex did furnish dials that are porcelain on early five digit DD's and DJ's, but these are definitely not stella dials. Here is one I had a few years ago that was sold to me as porcelain. I have no reason to doubt that, and it certainly looks like pocelain. Also note the smoother edges at the day and date windows, reminiscent of stella dials, and perhaps a source of the confusion.
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