The Oyster Perpetual Sky-Dweller is a compelling timepiece of revolutionary technological sophistication and ease of use. The Sky-Dweller provides the information global travelers need to easily keep track of time. 42mm 18K yellow gold case, bidirectional rotatable ring command bezel, champagne arabic dial, automatic Rolex caliber 9001 movement, second time-zone displayed via off-center rotating disc, Saros annual calendar with date at 3 o'clock and month indicated in discrete apertures at each of the 12 hour marks. Screw down crown. Brown crocodile leather strap with 18ct yellow gold folding oyster-lock clasp. Water resistant at 100 meters / 330 feet.