This omega speedmaster professional moonwatch features a black dial covered by a hesalite crystal and graced by a small seconds sub dial 30 minute recorder and 12 hour recorder along with a central chronograph hand the black bezel with its tachymetric scale is mounted on a 42 mm stainless steel case and presented on a matching bracelet crystal hesalite crystalcase steeldial blackwater resistance 5 bar 50 metres 167 feetsize 42mmcaliber omega 1861