Omega Constellation Co-Axial Watch - 38 mm Steel Case - White -Silvery Dial - 123.10.38.21.02.00238 mm stainless steel case, transparent back, bezel with tone in tone Roman numerals, domed scratch resistant sapphire crystal anti reflective treatment on both sides, white opaline silvery dial with a date window at 3 o'clock and a unique silk like pattern inspired by several Constellation models produced in the 1960s, Caliber Omega 8500 self winding movement with co axial escapement, chronometer, date, approximately 60 hours of power reserve,