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Watches featuring a « sonnerie » complication indicate the hour and quarters by means of hammers hitting bells or gongs which are tuned to different pitches. Chimes were originally made as a means of telling the time in the dark.
Watches featuring a Grande Sonnerie strike the hours and quarters in passing and repeats the hour at each quarter.
Watches featuring a « petite sonnerie » indicate hours and quarters without repeating hours at each quarter like « grande sonnerie » watches.
The power reserve indicator tells you the time the watch will continue to function. It can either be seen on hand winding or automatic watches.
Minute repeater watches ring whenever you activate the pusher (contrary to chimes). The most complicated ones can ring hours, quarters and minutes.
The tourbillon system was made to compensate the Earth’s gravitational force by mounting the escapement in a revolving cage. It gives the watch a better accuracy. This complication is known as one of the most difficult to make.
