IWC Pilot's Watch Chronograph 41 /Root/Start/Longines/Spirit making it as robust as

making it as robust as it is stylish

and water resistance is 30 meters

The day-night indicator at six o'clock gives the watch its name: a disc featuring a sun and moon shows which half of the day one is in — useful when setting calendar functions and while traveling

Glashütte Original Sixties (Reference 2-39-47-02-01-04)

The movement provides approximately 50 hours of power reserve

IWC Pilot's Watch Chronograph 41 /Root/Start/Longines/Spirit making it as robust asIWC Pilot's Watch Chronograph 41 (Reference IW388111) IWC's pilot's watches trace their origins to the Special Pilot's Watch of 1936. Their hallmarks to this day are the highly legible dial with a triangle at twelve o'clock and the soft iron inner case that shields the movement against magnetic fields. Manufacture calibre 69385 is a column wheel chronograph with 46 hours of power reserve, displaying elapsed time alongside date and day of the week.