Omega Speedmaster 38 Co-Axial Chronograph Watch - 38 mm Steel Case - Dual Diamond Bezel - Mother-Of-Pearl Diamond Dial - White Leather Strap - 324.38.38.50.55.00138 mm stainless steel case, dual bezel with a tachymeter scale on a white ceramic ring while the outside is diamond paved, scratch resistant sapphire crystal anti reflective treatment on both sides, white mother of pearl dial includes horizontal oval subdials which are diamond trimmed 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