- Instrument - Sinn Instrument 657 S D (SN-135)
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The 657 range of instrument watches is based on the 656 line. The 657 S is an all-black timepiece that focuses on instant readability. It is equipped with ETA 2824-2 automatic calibre that performs 28 800 vibrations per hour and has 25 bearing jewels. The extreme protection from magnetic fields is one of the most prominent characteristics of this model. Additional features include a captive pilot's bezel that measures elapsed time, a date window located between 4 and 5 o'clock, luminous dial elements, nickel-free case back and scratch resistant sapphire crystal glass with anti-reflective coating.
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