Watch Complications
Date Complications
Date Window
The date window is the most common and widely used watch complication. It displays the date through a small aperture on the dial, typically positioned at 3 o’clock, though other placements are also common. Valued for its simplicity and practicality, the date window allows for easy, at-a-glance reading.
Big Date Complication
A big date complication follows the same principle as a standard date window but presents the numerals in a larger format for improved legibility. This is often achieved using two separate discs displayed through two windows, though some designs feature a single enlarged aperture. Big date displays are particularly popular with those who prefer clear, easy-to-read dials.
Pointer Date
A pointer date complication uses an additional central hand to indicate the date. This hand points to a numbered scale positioned around the outer edge of the dial, creating a classic and visually distinctive alternative to a traditional date window. Pointer date watches are appreciated for their vintage-inspired appearance and balanced dial design.
Subsidiary Dial
A subsidiary dial is a small sub-dial used to display additional information without relying on a window or central hand. When used for date indication, the date is shown on a dedicated sub-dial rather than through a traditional date window. Subsidiary dials add visual balance and a more traditional, refined aesthetic to the watch dial.
Day-Date Complication
A day-date complication displays both the day of the week and the date. Similar to a standard date window, this information may appear together or be positioned separately on the dial, depending on the movement and design of the watch. Day-date watches are valued for their practicality, offering clear and convenient calendar information at a glance.
Perpetual Calendar
A perpetual calendar is one of the most sophisticated date complications in watchmaking. It automatically displays the date, day, month, and year, while also accounting for leap years. Once correctly set, a perpetual calendar will remain accurate without manual adjustment, even during months of varying lengths. Due to the complexity of their mechanical construction, watches featuring a perpetual calendar are typically more expensive and highly regarded for their technical achievement and practicality.
Annual Calendar
An annual calendar is similar in appearance to a perpetual calendar, displaying the date, day, and month. However, it does not account for leap years. As a result, the watch will incorrectly display 31st February and must be manually adjusted once a year at the end of February. Annual calendar watches offer a balance between functionality and complexity, making them a popular alternative to perpetual calendars.
Chronograph Watch Complications
A chronograph is a watch complication that allows the wearer to measure elapsed time, functioning much like a stopwatch on the wrist. Chronograph watches come in a variety of designs and commonly feature two or three sub-dials used to record seconds, minutes, and sometimes hours. They are also easily identified by the pushers located on the side of the case, which control the start, stop, and reset functions of the chronograph.
Monopoussoir (One-Button Chronograph)
Early chronograph watches were operated using a single pusher, known as a monopoussoir. This design remained standard until 1923, when Breitling introduced the first two-button chronograph. With a monopoussoir chronograph, all chronograph functions—start, stop, and reset—are controlled by one button. Unlike two-button chronographs, monopoussoir models cannot measure interrupted or multiple time intervals.
Retour-En-Vol (Flyback Chronograph)
A flyback chronograph allows the wearer to reset and restart the chronograph instantly with a single press of the reset pusher while the chronograph is still running. In contrast, a standard chronograph requires the chronograph to be stopped before it can be reset and started again. This makes flyback chronographs particularly useful for timing consecutive events quickly and efficiently.
Rattrapante (Split-Seconds Chronograph)
A rattrapante, or split-seconds chronograph, enables the timing of two events that start simultaneously but finish at different times. This is achieved through an additional chronograph seconds hand that can be stopped independently while the primary chronograph hand continues running. One of the defining features of a split-seconds chronograph is the presence of two central seconds hands positioned one above the other on the dial.
Tachymeter
A tachymeter is a scale found on certain watches that allows the wearer to calculate speed over a known distance. Typically positioned on the outer or inner bezel, the tachymeter is most commonly used in conjunction with a chronograph function. By measuring how long it takes to travel a fixed distance, the tachymeter can display speed directly on the scale, making it a popular feature in motorsport-inspired and sports watches.
Travel Complications
GMT (Greenwich Mean Time)
Watches equipped with a GMT function allow the wearer to track two or more time zones simultaneously. This is typically achieved through an additional hour hand that completes one rotation every 24 hours and works alongside a 24-hour scale. GMT watches are especially popular with frequent travellers and professionals who need to monitor time in different locations at a glance.
World Time Complication
The world time complication, as we recognise it today, was developed in the 1930s by watchmaker Louis Cottier. This sophisticated feature displays the time across all 24 global time zones at once, usually indicated by a rotating 24-hour ring and a list of major cities positioned around the dial or bezel. World time watches offer an impressive and practical solution for keeping track of global time differences.
Other Watch Complications
Moonphase Watch Complication
Originally developed for maritime use to help sailors track tidal patterns, the moonphase complication is now most often appreciated for its visual elegance. A moonphase display indicates the current phase of the moon, showing whether it is new, quarter, half, or full, adding both beauty and tradition to a watch dial.
Watch Power Reserve Indicator
A power reserve indicator is a practical and informative complication found on mechanical watches. It displays the amount of energy remaining in the watch’s mainspring once the watch has been wound. This allows the wearer to see how long the watch will continue running before it needs winding again. Power reserve indicators may be displayed in hours, days, or via a simple gauge-style marker on the dial.
Jumping Hour Complication
Watches with a jumping hour complication do not feature traditional hour markers around the dial. Instead, the hour is displayed through a dedicated aperture that changes, or “jumps,” instantaneously—most commonly when the minute hand reaches 12 o’clock. The minutes are typically shown around the dial, creating a striking and unconventional display that is increasingly popular for its bold, eye-catching design.
Alarm Function
An alarm complication allows a time to be set independently from the main time display. When the set time is reached, the watch alerts the wearer. Depending on the model, the alert may be audible, vibrational, or visual, such as illumination of the dial.
Single-Handed Watches
Single-handed watches offer a minimalist and distinctive way of telling the time. Rather than using separate hour and minute hands, these watches rely on a single hour hand. The minute reading is indicated by markers between the hour indices, with each marker typically representing five minutes. For example, if the hour hand points to the second marker between 1 and 2, the time would be 1:10.
Tourbillon Watch Complication
The tourbillon is one of the most complex and prestigious complications in watchmaking. Designed to improve accuracy, it counters the effects of gravity by mounting the escapement and balance wheel within a continuously rotating cage. This helps minimise positional errors and enhance timekeeping performance. Due to the skill required to create them, tourbillons are usually found only in high-end and luxury timepieces.
