Omega Speedmaster Chronograph Ref 3573.50 Stainless steel case with a stainless steel bracelet. Fixed black ion-plated bezel with tachymeter. Black dial with luminous hands and stick hour markers. Minute markers around the outer rim. Luminescent minute markers around the outer rim. Chronograph - three sub-dials displaying: 60 seconds, 30 minutes and 12 hours. Manual winding chronograph movement. Scratch resistant sapphire crystal. Skeletal case back. Case diameter: 42 mm. Case thickness: 14.3 mm. Double locking deployment clasp. Water resistant at 50 meters / 165 feet. Functions: hours, minutes, seconds, chronograph, tachymeter, Like New with box and papers