As this is the price for a Rolex DeepSea, or an IWC's Deep One.
But this is a Seiko; a very special watch called Spring Driving Watch was made with a mechanical auto winding mechanism to reserve the power. As the main spring unwinds, it provides power for driving the hands controlled through the Regulator called Try-synchro regulator. A small fraction of the mainspring power is to generate satiny current to drive an Oscillator and an IC. The precise reference signal of the IC will coordinate with the speed as the mainspring unwinds. A delicately controlled electromagnetic brake is applied to ensure the mainspring unwinds is exactly the right rate to match the watch oscillators for accurate timekeeping. The Electro magnetic brake will keeps hands for an accurate time.
Since there is no conventional escapement, the movement is smooth, the hands is swing smoothly and continuously as naturally flowing movement. The power reserve maintains 72 hours operation, the accuracy can be +/-1 second a day. A glide motion hand.
This is a Diver's watch, very heavy and sturdy built, I can say heavier than a DeepSea. Very Strong Steel to make the case, beautiful, it is selling at Yen 598,500!
HK Snob
