Produced by TVS .TVS Factory Omega Omega Speedmaster Series OB2 Co Axial Chronograph Watch .Model: 311.30.44.51.01.002 .TVS independently developed 9900 type Master Chronometer dual T movement with a 3 o clock sub dial for 12 hour and 60 minute cumulative timing. All functions and appearances match the original, showcasing TVS s craftsmanship.Vibrating frequency: 28,800 vibrations per hour .Power reserve: 60 hours .Stainless steel case with a domed double sided anti reflective scratch resistant glass .The best luxury gift recommendation, trust in TVS s exclusive quality.