Omega Constellation Co-Axial Watch - 38 mm Steel Case - Blue Dial - 123.10.38.21.03.00138 mm stainless steel case, transparent back, stainless steel bezel, domed scratch resistant sapphire crystal with anti reflective treatment on both sides, Blue dial with an embossed lozenge pattern and a date window at 3 oclock and its engraved roman numerals, caliber 8500 self winding movement with automatic winding in both directions to reduce winding time, approximately 60 hours of power reserve, stainless steel bracelet. Water resistant to 10 bar.