OmegaSpeedmaster Moonwatch Professional Dark Side of the Moon Sedna Black Chronograph 44.25mm

From the retailer listing

Omega Moonwatch Sedna Black Co-Axial Chronograph 44.25mm It was the adventures and the accomplishments of the Apollo 8 astronauts that inspired the all-black, ceramic Speedmaster Dark Side of the Moon, but it is the mystique of the Earth's nightlight and its ever-changing yet constant presence that has spurred the creation of the Speedmaster Dark Side of the Moon Sedna Black". This 44.25 mm model has a completely brushed black ceramic case with an 18K Sedna™ gold bezel ring which matches the 18 Sedna™ gold applied indexes and hands. The marks on the matt grey dial have been created using laser ablation. The "Sedna Black" is presented on a black leather strap with a brushed ceramic foldover clasp. At its heart is the OMEGA Co-Axial calibre 9300."