Omega seamaster aqua terra 150 m omega co axial 415 mm omega seamaster aqua terra is the worlds first completely anti magnetic timepiecemovement caliber omega 8508 anti magnetic self winding movement with co axial escapement for greater precision stability and durability free sprung balance 2 barrels mounted in series automatic winding in both directions to reduce winding time blackened screws barrels and balance wheel power reserve 60 hourscase steeldial blackcase diameter