Omega Seamaster 1948 Omega Co-Axial Master Chronometer Small Seconds 38 mm Omega Seamaster 1948 Omega Co-Axial Master Chronometer 38 mm Omega Seamaster 1948 Omega Co-Axial Master Chronometer Small Seconds 38 mm Omega Seamaster 1948 Omega Co-Axial Master Chronometer 38 mm