Omega 231.13.42.21.03.001
Omega Seamaster series, model: 231.13.42.21.03.001, automatic mechanical, 41.5mm case diameter, stainless steel case, blue teak concept texture dial, date window at 3 o 'clock, arched double-sided anti-reflective sapphire crystal, water-resistant to 150 meters, transparent case back fully showcases the movement's operation.