Photo by Alex, The Purists

It is the Tour de l’Ile, the world’s most complicated wristwatch by Vacheron et Constantin. It has:

hours and minutes
seconds at 6 o’clock
repetition of the quarters and minutes on request
“Tourbillon” device
power reserve
second time zone
phases of the moon
age of the moon
torque of the striking mechanism
perpetual calendar
– day
– date
– month
– leap years
perpetual equation of time
sky chart

Click here for a Purists introduction on this watch