Speaking of the RCO PN (Oyster Down PN), the black Ref.6263 PN is famous yet there is actually one that seems to have a normal dial. This is the Ref.6240 silver dial Oyster Down PN. The font is also different from the so-called black Oyster Down PN, if there is such a thing, right …

This is the black Oyster Down PN, Ref.6263.