Sinn’s navigation watches are designed to be primarily functional and very easy to read. This 656 timepiece is equipped with ETA 2824-2 automatic calibre. It performs 28 800 vibrations per hour and has 25 bearing jewels. Extreme protection from magnetic influences is one of the most important features. Additional functionalities include pressure resistance, a date window located between the 4 and 5 o’clock marks, nickel-free caseback, luminous hands and scratch-resistant sapphire crystal glass with anti-reflective coating.