Rolex Oyster Perpetual Mid Size Datejust 31 model reference 178273. Steel and yellow gold 31mm case which is water resistant to 100 meters. Automatic chronometer movement. Silver Jubilee dial with diamond hour markers. Yellow gold fluted bezel. Bi-metal Jubilee bracelet with folding crownclasp. Box and papers dated April 2018. Rolex seals still in place on the case.