The 657 is the updated version of Sinn’s 656 watches – this timepiece is larger and comes with a rotating elapsed time bezel. The watch utilizes ETA 2824-2 automatic movement. It performs 28 800 vibrations per hour and has 25 bearing jewels. One of the most prominent features is the extreme protection from magnetic fields. Additional functionalities include a date window located between the 4 and 5 o’clock marks, pressure resistance, nickel-free case back and scratch-resistant sapphire crystal glass with anti-reflective coating.