The dramatic and enduring design of the OMEGA Constellation is characterised by its famous half-moons, “claws” on the case and mono-rang bracelet.This 39 mm stainless steel and 18K yellow gold model features a bezel engraved with Roman numerals, a sun-brushed champagne dial with diamond indexes and a date window at the 6 o'clock position. The hands, OMEGA logo, Constellation star and diamond holders are all in 18K yellow gold.At the heart of this timepiece is the OMEGA Co-Axial Master Chronometer Calibre 8800, visible through the domed scratch-resistant sapphire crystal.

Features
Anti-magnetic: The movement is unaffected by exposure to strong magnetic fields, even those greater than 1.5 tesla (15,000 gauss).
Chronometer: Label given to a watch which has undergone precision tests and received a certificate from an official body (COSC).
Date: The day of the month, displayed in a window on a watch dial at the 3 or 6 o’clock position, or within a subdial at 9 o'clock.
Diamonds: The hardest, most luminous precious stone whose value is calculated according to the 4C criteria: Cut - Carat - Clarity - Color.
Master Chronometer Certified: Guaranteeing the Swiss industry’s highest standard of precision, performance and magnetic-resistance, as set by the Swiss Federal Institute of Metrology (METAS).
Transparent caseback: A transparent caseback - frequently made of sapphire - makes it possible to see the movement inside the watch.

Technical Data
Reference: 131.20.39.20.58.001
Lug‑to‑lug: 41.00 mm
Thickness: 12.43 mm
Case diameter: 39 mm
Case: Steel ‑ yellow gold
Dial colour: Yellow
Crystal: Domed scratch‑resistant sapphire crystal with anti‑reflective treatment on both sides
Water resistance: 5 bar (50 metres / 165 feet)
Total product weight (approx.): 99 g
Calibre: Omega 8800
Movement Type: Self winding
Power reserve: 55 hours

Bracelet
Material: Steel ‑ yellow gold
Type of Clasp: Butterfly clasp with comfort setting