The Rolex Sky-Dweller has a 42mm White Rolesor case that is comprised of a 904L steel monoblock middle case, screw-down back, screw-down crown, 18K white gold fluted bezel with bidirectional rotatable Rolex Ring Command, scratch-resistant sapphire crystal with cyclops lens over the date and double white dial, index hour markers. Rolex caliber 9001 automatic movements second time-zone displayed via off-center rotating disc, Saros annual calendar with a date at 3 o’clock and month indicated in discrete apertures at each of the 12-hour marks, stainless steel Oyster bracelet, folding Oysterclasp buckle with Easylink 5mm comfort extension link. Water-resistant up to 100 meters