Omega Speedmaster 38 Co-Axial Chronograph Watch - 38 mm Steel Case - Blue Dial - 324.30.38.50.03.00138 mm stainless steel case, bezel which includes a tachymeter scale on a blue aluminium ring, scratch resistant sapphire crystal anti reflective treatment on both sides, sun brushed blue dial includes horizontal oval subdials and a vertical oval date window at 6 oclock, tachymeter scale, Caliber Omega 3330 self winding movement with chronograph, chronometer, date, approximately 52 hours of power reserve, stainless steel bracelet. Water resistant to 10