The Rolex Datejust reference 278240-0012 features a stainless steel case with a 31mm diameter. This model, produced in 2020, is powered by the automatic winding Rolex caliber 2236. It includes a green dial and displays the date function prominently. Additionally, this watch is certified as a chronometer, ensuring precision in timekeeping. The combination of these elements makes it a notable piece in the Datejust collection.