Rolex 128239-0005 Polished 18kt white gold case. Polished 18kt white gold Twinlock crown. Polished 18kt white gold fluted (wave design) bezel. Dial: silver. Polished white gold hands. Index markers. Features: Day of the week window displayed at the 12 o'clock position. Date window displayed at the 3 o'clock position with a cyclops magnifying lens. Instant & simultaneous day & date change at midnight.  Rolex in-house calibre 3255, beats at 28,800 vph, contains 31 jewels & has an approximate power reserve of 70.