Rolex Datejust 31mm Dark Grey Roman on Oyster 278240Overview The smooth bezel, Oyster bracelet, and absence of precious metal in the construction define the 278240 as the Datejust 31 at its most deliberately pared back. Most buyers approaching the Datejust 31 consider the Jubilee bracelet and fluted or diamond bezel configurations first; the all Oystersteel Oyster variant occupies the opposite end of that range and the dark grey Roman dial reinforces rather than softens that character. The case is