Stainless steel case and bracelet. Fixed bezel with black ceramic insert showing tachymeter markings. Matt black dial featuring luminous orange hands and index hour markers. Minute markers around outer rim. Analog display type with luminescent hours, minutes, and seconds indicators visible in low light conditions. Date window at the 6 o'clock position. Chronograph functions include two sub-dials: one for measuring elapsed time to 60 seconds (or minutes via a sweep hand) and another displaying up to 12 hours of accumulated time. Powered by Omega Calibre 9900 automatic movement, which is based on the Omega 9300 family with 54 jewels and operates at 28800 vph (7.2 Hz). Offers a power reserve of approximately 60 hours. Scratch resistant sapphire crystal. Equipped with push/pull winding crown for manual operation when needed or to stop/start chronograph functions. Transparent case back allows visibility of the movement. Round case shape measures 44.25 mm in width, and the band has dimensions of 21 mm. Secured by a fold-over clasp with push button release mechanism. Water resistant up to 50 meters / 165 feet.
![Omega Constellation Automatic Chronometer Diamond Grey Dial Ladies Watch [131.15.29.20.56]](https://cdn.lepodium.net/images/000/085/85042-2.jpg)