The dramatic and enduring design of the OMEGA Constellation is characterised by its famous half-moons, as well as the “claws” on the side of the case. This 41 mm 18K yellow gold model features a polished black ceramic bezel with Roman numerals in Ceragold™, a sun-brushed black dial and a date window at the 6 o\'clock position. The hands, OMEGA logo, Constellation star and facetted indexes are all in 18K yellow gold. Presented on a black leather strap with rubber lining, this timepiece is driven by the OMEGA Co-Axial Master Chronometer Calibre 8901, visible through the domed scratch-resistant sapphire crystal. Calibre Omega 8901: Automatic winding movement with co-axial escapement. Certified by METAS as a Master Chronometer, insensitive to magnetic fields of up to 15, 000 Gauss. Free balance spring with spiral spring made of silicon, two barrels installed one behind the other, automatic double-sided winding. Time zone function. 18K Sedna ™ gold rotor and balance bridge and luxurious finish with Geneva stripe arabesques. 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. TECHNICAL DATABetween Lugs24. 2mm Bracelet Leather Strap Case Yellow gold Case Diameter: