Every watch is a universe of precision. Discover the fundamental components and complications that bring these exceptional timepieces to life.
The physical elements that make up the watch, from case to bracelet.
The outer structure of the watch that houses all internal components. Cases can be made of stainless steel, titanium, gold or other materials. They may be round, square, rectangular or barrel-shaped, with straight, curved or 'cow-horn' lugs. They can be thick or ultra-thin, with a transparent or solid caseback. The case defines the watch's identity.
The part of the watch where hours, minutes and seconds are displayed. It may feature indices or numerals to indicate the time, as well as other indications such as the date, day of the week, moon phase, power reserve and many other complications.
Moving elements on the dial indicating the time. There are several types: Baton (rectangular and straight), Dauphine (elegant and tapered), Lance (arrow-shaped), Broad Arrow, Leaf (elongated with rounded ends), Snowflake (Tudor's signature), and Breguet (hollowed apple shape, invented by Abraham-Louis Breguet in the 18th century). Some watches also have a GMT hand for a second time zone.
The internal mechanism that allows the watch to measure time. There are mechanical movements (manual or automatic winding) and quartz (battery-powered). The movement includes gears, springs, wheels and other components. Mechanical movements are considered more prestigious, even though they are less accurate than quartz.
The band that wraps around the wrist and holds the watch in place. Bracelets can be made of stainless steel, leather, fabric or rubber. They feature a pin buckle or a deployant clasp (single or double). The deployant clasp provides secure hold and comfortable adjustment.
A small button on the side of the case, used to set the time, date and other functions. In mechanical watches, it can also be used for winding. It can be screw-down or push-pull and is an important waterproofing element.
A rotating or fixed ring around the dial. On dive watches, it is unidirectional and used to measure immersion time. It can also serve for reading a tachymeter, currency conversion or other calculations. Rotating bezels are usually notched.
The transparent surface protecting the dial. Sapphire crystal is the most scratch-resistant but must be replaced if scratched. Mineral glass can be hardened. Acrylic glass, considered 'vintage', scratches easily but can be polished. Some Rolex watches feature a 'cyclops', a magnifying lens (×2.5) above the date.
Marks or numbers indicating the hours on the dial. They can be batons, Arabic or Roman numerals. Some indices are treated with Super Luminova® for optimal visibility in the dark.
The bottom part of the case, in contact with the skin. It can be transparent to reveal the movement, or engraved with technical or personal information.
A component of automatic watches that rotates with wrist movement, transmitting kinetic energy to the mainspring for winding. It can be decorated or made from precious metal such as gold or platinum.
Found on chronograph watches, they are used to start, stop and reset time measurements. Some chronographs feature a 'Flyback' function, allowing reset and restart with a single press.
Additional dials displaying supplementary information: chronograph counters, moon phase, day/night indicators, pulsometer or telemeter scales. They are placed at various positions on the main dial.
The additional functions that enrich the watch beyond simple timekeeping.
A small window usually located at 3 o'clock on the dial, displaying the current date. The date can be 'perpetual' (accounting for leap years, requiring no adjustment for decades) or 'annual' (requiring adjustment once a year, at the end of February).
An indication of how long the watch will continue to run after being fully wound. Typically 48 or 72 hours, it can extend to 5 or 7 days on certain models.
Found on some sport watches, it measures average speed based on elapsed time over a given distance. The most famous is on the Rolex Daytona.
A complication found in high-end watches displaying the current phase of the moon by showing the illuminated portion of the lunar disc.
Also called 'split-second', this complication allows simultaneous measurement of multiple independent time intervals, ideal for timing overlapping events.
A sophisticated complication designed to compensate for the effects of gravity. The escapement and balance wheel rotate in a rotating cage to improve accuracy. It is a rare, prestigious and delicate complication.
A 'striking' watch capable of chiming the hours, quarters and minutes on demand through a complex system of hammers and gongs. It is a very rare and prestigious complication.
Found on pilot watches, it allows calculation of speed, fuel consumption, distance and flight time. The most famous is on the Breitling Navitimer.
A complication that displays a second time zone via an additional hand on a 24-hour scale. The most famous GMT watch is the Rolex GMT-Master.
The internal organs that beat at the heart of the calibre and ensure the measurement of time.
The power source of the mechanical movement. This long steel ribbon coiled in a spiral inside the barrel stores energy during winding (manual or automatic) and releases it gradually to power the watch. Its length determines the power reserve.
A cylindrical housing containing the mainspring. It transmits energy to the gear train via its external teeth. In some high-end calibres, two or even three barrels are arranged in series to increase the power reserve.
A series of toothed wheels that transmit energy from the barrel to the escapement by multiplying it. It includes the centre wheel (minute hand), intermediate wheel, seconds wheel and escape wheel. Each wheel turns at a precise speed.
The regulatory organ that releases energy from the gear train in a controlled manner, impulse by impulse. The Swiss lever escapement is the most widespread: the lever alternates between locking and releasing the escape wheel, producing the characteristic 'tick-tock' of a mechanical watch.
A T-shaped or fork-shaped piece that interacts with the escape wheel. Its two pallets (synthetic ruby stones) alternately lock and release the teeth of the escape wheel, ensuring regularity of the rate.
An oscillating wheel that beats at the heart of the movement, serving as the frequency regulator. It oscillates at a precise frequency (typically between 21,600 and 36,000 vibrations per hour). Its mass and inertia determine the watch's accuracy.
A thin spiral-shaped spring attached to the balance wheel. It returns the balance to its rest position after each oscillation, like a miniature pendulum. The quality and material of the hairspring (steel, silicon, Nivarox) directly influence accuracy and resistance to magnetic fields.
Synthetic corundum (ruby) stones serving as bearings for wheel axles and friction surfaces for the escapement. They reduce wear and friction. A standard mechanical movement typically has between 17 and 25 jewels. The more complications, the more jewels.
The base plate of the movement on which all other components are mounted. It serves as the supporting structure and contains housings for wheel pivots. Usually made of brass, it can be decorated (Côtes de Genève, perlage, bevelling).
Pieces fixed to the main plate that hold the wheel axles in place. Each bridge covers and supports one or more movement components. They are often decorated with artisanal finishes (bevelling, Côtes de Genève, satin-finishing) that reveal the manufacture's craftsmanship.
A system for adjusting the active length of the hairspring to regulate the watch's accuracy. The regulator shortens or lengthens the hairspring, modifying the balance wheel's oscillation frequency. Some high-end movements use a free-sprung balance (without a regulator) adjusted by mass screws on the balance.
The shaft connecting the crown to the winding and time-setting mechanism. In its normal position, it winds the mainspring barrel. When pulled, it engages the time-setting mechanism via the clutch and yoke.
Exclusive to automatic movements, this half-disc pivots freely through 360° thanks to wrist movements. Via a reduction and click system, it transmits kinetic energy to the barrel for automatic winding. It can be made of tungsten, gold or platinum to maximise inertia.
The click is an anti-reverse mechanism that prevents the mainspring from unwinding. The column wheel, found in high-end chronographs, coordinates the engagement and disengagement of chronograph functions with precision and smoothness.
"To understand the watch is to learn to read time differently."