The dramatic and enduring design of the OMEGA Constellation is characterised by its famous half-moon facets and “claws” on the case.

This 41 mm model, in stainless steel and 18K Yellow gold, features a black polished ceramic bezel ring with Roman numerals filled with OMEGA Ceragold™. It has a sun-brushed green dial with gradient effect and a date window at the 6 o'clock position. The hands, OMEGA logo, Constellation star and indexes are also in 18K Yellow gold.

Replacing the famous mono-rang bracelet is a green leather strap with rubber lining.

At the heart of this timepiece is the OMEGA Co-Axial Master Chronometer Calibre 8900, visible through the 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.
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).
Time zone function: Allows the hour hand to be easily adjusted to different time zones without stopping the watch.
Transparent caseback: A transparent caseback - frequently made of sapphire - makes it possible to see the movement inside the watch.

Technical Data
Reference: 131.23.41.21.10.001
Lug‑to‑lug: 44.00 mm
Thickness: 13.50 mm
Case diameter: 41 mm
Case: Steel ‑ yellow gold
Dial colour: Green
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.): 114 g
Calibre: Omega 8900
Movement Type: Self winding
Power reserve: 60 hours

Strap
Strap color: Green
Strap type: Leather strap
Strap surface: Rubber / alligator leather
Strap underside: Rubber
Buckle type: Foldover clasp
Buckle material: Stainless steel