Omega 210.30.44.51.01.001
Omega, Seamaster series, 210.30.44.51.01.001, popular new Seamaster 300 chronograph, 44mm diameter, black water ripple dial, double small dial chronograph function, 6 o'clock calendar display, with helium exhaust valve, equipped with self-produced top 9900 coaxial master astronomical observatory movement through the back, 300 meters waterproof, full set