Constellation Co-Axial Master Chronometer

From the retailer listing

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 stainless steel and 18K Sedna™ Gold model features a polished black ceramic bezel with Roman numerals in OMEGA Ceragold™. The sun-brushed dial is lacquered for a glossy look, and features a gradient effect that transitions from burgundy to black. There is a date window at the 6 o'clock position, while the hands, OMEGA logo, Constellation star and facetted indexes are all crafted in 18K Sedna™ Gold. Presented on a burgundy leather strap with rubber lining, this timepiece is driven by the OMEGA Co-Axial Master Chronometer Calibre 8900, visible through the domed scratch-resistant sapphire crystal.