asJ Production .TVS Omega OB2 Speedmaster Co Axial Chronograph Watch, Model 311.30.44.51.01.002 .TVS independently developed 9300 model Master Chronometer dual T movement, featuring a 12 hour and 60 minute cumulative chronograph subdial at the 3 o clock position. All functions and appearance are consistent with the original. A masterpiece of craftsmanship by TVS.Vibration frequency: 28,800 vibrations per hour .Power reserve: 60 hours .Stainless steel case with arched double sided anti reflective scratch resistant glass. S1 exquisite recommendation for men s multifunctional mechanical watch.