Omega Speedmaster Broad Arrow Co-Axial GMT Mens Watch 3581.30.00. Officially certified chronometer automatic self-winding movement. Caliber 3603. Functions - Chronograph, 24 hours GMT, Tachymeter. Stainless steel case 44.25 mm in diameter. Omega logo on a crown. Transparent case back. Stainless steel tachimeter bezel. Scratch resistant sapphire crystal. Off-white dial with luminous hands and hour markers. Date window at 6 o'clock aperture. Brushed and polished stainless steel bracelet with fold over clasp. Fits 8" wrist.