Rolex Oyster Perpetual Datejust in a two-tone or Rolesor configuration, combining stainless steel and yellow gold.

 a Rolex Oyster Perpetual Datejust in a two-tone or Rolesor configuration, combining stainless steel and yellow gold.
Key identifying features are:
* Model: Rolex Oyster Perpetual Datejust, which is printed on the dial. The Datejust is recognizable by its date window at 3 o'clock, magnified by the Cyclops lens.
* Material (Rolesor): The watch is two-tone, a combination Rolex calls Rolesor. The case, outer links of the bracelet, and the smooth bezel are stainless steel, while the crown and the inner links of the bracelet are yellow gold.
* Dial: The dial is a grey/slate color with a sunray finish and features yellow gold Roman numerals as hour markers.
* Bezel: It has a smooth bezel.
* Bracelet: It has the three-piece link Oyster bracelet, which is two-tone.
* Size: While it's difficult to determine the exact diameter from a photo, the size and proportions are very consistent with the classic 31mm Datejust.
Possible Reference Numbers
For a Rolex Datejust 31 (the most likely size) in Yellow Rolesor (two-tone yellow gold and steel) with a smooth bezel and Oyster bracelet, the most probable modern and vintage