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 29 mm 18K yellow gold and stainless steel model features a bezel engraved with Roman numerals, crystal white slivery dial and a date window at the 6 o\'clock position. The hands, OMEGA logo, Constellation star and indexes are also in 18K yellow gold. At the heart of this timepiece is the OMEGA Co-Axial Master Chronometer Calibre 8700, visible through the domed scratch-resistant sapphire crystal. Calibre Omega 8700: Self-winding movement with Co-Axial escapement. Certified Master Chronometer, approved by METAS, resistant to magnetic fields reaching 15, 000 gauss. Free sprung-balance with silicon balance spring, automatic winding in both directions. Rhodium plated finish with Geneva waves in arabesque. FEATURESAnti-magnetic: The movement is unaffected by exposure to strong magnetic fields, even those greater than 1. 5 tesla (15, 000 gauss).Automatic watch: A self-winding watch or automatic watch uses a mechanical movement whose main spring is wound automatically by the natural motion of the wearer\'s arm. 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).Transparent case back: A transparent case back - frequently made of sapphire - makes it possible to see the movement inside the watch. Between lugs17. 6mm Bracelet Steel - yellow gold Case Steel - yellow gold Case diameter29mm Dial colour Silver Crystal Domed scratch-resistant sapphire crystal with anti-reflective treatment on both sides Water resistance50 metres