Omega Speedmaster Co-Axial Chronograph Watch - 38 mm Steel Case - Dual Diamond Bezel - Sun Brushed Grey Dial - Grey Leather Strap - 324.38.38.50.06.00138 mm stainless steel case, dual bezel with diamonds on the outer section and tachymeter scale on the black aluminum inner ring, scratch resistant sapphire crystal with anti reflective treatment on both sides, sun brushed grey dial, caliber 3330 self winding movement with chronograph function and a small seconds subdial at 3, 6 and 9 o'clock, approximately 52 hours of power reserve, grey leather strap. Water resistant to 100 m (330 ft).