Sinn is a brand that originally produced pilot’s watches and this background is reflected in the precision and functionality of Sinn watches today. This 656 series watch is mainly known for its extreme protection from magnetic fields. The watch comes with Swiss-made ETA 2824-2 automatic calibre. It performs 28 800 vibrations per hour and the mechanism brags 25 jewels. Additional functionalities include pressure resistance, sapphire crystal glass that is scratch-resistant and a date window located at the 4:30 mark. Numerals are large and luminous for improved night time visibility.