Rolex Oyster Perpetual Sky-Dweller Ref 326138. 42mm yellow Gold case, which is water resistant to 100m / 330ft. Automatic chronometer Rolex 9001 calibre movement, 28,800, 40 jewels and a power reserve of 72 hours. Paramagnetic Blue Parachrom hairspring and high performance Paraflex shock absorbers. Silver dial with roman numeral hour markers, 12 apertures around the edge of the dial to indicate the month, centre disk indicates 24 hour display and date at 3 o’clock. Functions: Saros system Annual Calendar, GMT, Month, date, hours, minutes, seconds. Fluted bi-directional Ring Command bezel. Brown Croc strap with 18ct Yellow Gold clasp. Box and papers dated December 2016.