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Watch Complication

A watch complication is any function that may be an addition to a watch telling the time. Complications can vary from being a simple addition to exceptionally rare and complex works of high horology that can take years to create and perfect.
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Annual Calendar

Chronograph

Constant Escapement

Dual Time/GMT

Equation of Time

Fly Back

Minute Repeater

Moon Phase

Perpetual Calendar

Power Reserve Indicator

Retrograde

Tourbillon