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Home · Watch glossary
Understand the language of fine watches. Explore movements, complications, case measurements and pre-owned condition terms with this guide from Prestige Watch New York.
The angle through which a mechanical watch’s balance swings. A watchmaker measures amplitude alongside other timing readings to assess how the movement is running. Expected values vary with the calibre, position and state of winding.
See also Balance wheel · Calibre
A calendar mechanism that accounts for months with 30 or 31 days. It usually needs a manual correction at the end of February, provided the watch stays wound and is set correctly.
See also Perpetual calendar · Complication
A description of a watch’s resistance to magnetic fields. Materials, construction and testing standards influence the level of resistance. Check the specification for the particular reference when comparing watches.
See also Master Chronometer · Movement
An opening in a dial through which an indication is displayed. A date window is a familiar example. More complex watches can use apertures for the day, month or a jumping-hour display.
See also Dial · Complication
A mechanical movement that winds its mainspring through the motion of a rotor as the watch moves on the wrist. Many automatic watches also support manual winding through the crown.
See also Rotor · Mainspring · Hand-wound
The oscillating wheel that works with a hairspring to regulate the rate of a mechanical watch. Energy supplied through the escapement keeps the balance moving as the gear train advances.
See also Escapement · Amplitude
The drum that houses a mechanical watch’s mainspring. As the spring unwinds, the barrel supplies energy to the movement. Some calibres use several barrels to achieve a particular power reserve or construction.
See also Mainspring · Power reserve
The ring surrounding the watch crystal. A bezel may be fixed or rotating, decorative or functional. Graduated bezels can help track elapsed time, another time zone or a calculation, depending on the watch.
See also Sapphire crystal · GMT · Tachymeter
A listing description indicating that a watch is accompanied by a box and documentation. Ask which items are included, such as the original warranty card, certificate, manuals or service records, and check that identifying details correspond.
See also Full set · Reference number · Service history
A linked band, usually metal, that secures a watch to the wrist. Bracelet length, removable links, clasp design and adjustment range all affect fit. Confirm the included links when considering a pre-owned watch.
See also Deployant clasp · Integrated bracelet · Pre-owned
A movement component fixed to the mainplate that supports the pivots of wheels or other parts. Bridges can also carry decorative finishes and may be visible through a transparent caseback.
See also Movement · Display caseback
The designation or model of a watch movement, also spelled caliber. A calibre number helps identify the movement’s architecture, functions and specifications, even when it appears in several different watch references.
See also Movement · Reference number · In-house movement
The width of the watch case, commonly stated in millimetres and measured across the case body. Sellers generally exclude the crown. Case shape, thickness and lug-to-lug length also influence how large the watch feels.
See also Lug-to-lug · Crown · Tonneau
A hard material used for components such as cases, bracelets and bezel inserts. Its properties depend on the formulation and construction. Handle a ceramic watch carefully around sharp impacts and follow the manufacturer’s care guidance.
A function for starting, stopping and resetting an elapsed-time measurement while the watch continues to show the time. Pushers usually control the timer, and subdials may record elapsed minutes or hours.
See also Flyback · Rattrapante · Tachymeter
A precision designation supported by testing under a specified standard. For the traditional COSC mechanical certification, the average daily rate criterion is −4 to +6 seconds under laboratory test conditions. Check the particular certification claimed.
See also Master Chronometer · Calibre
An additional watch function beyond basic time display. Examples include a calendar, chronograph, second time zone or minute repeater. The term describes functionality within the watch’s movement and display.
See also Chronograph · Perpetual calendar · Minute repeater
The external control used to wind a watch, set the time or adjust certain functions. Its positions and operation vary by calibre. Follow the watch’s instructions before changing calendar indications.
See also Screw-down crown · Winding
A folding clasp that opens on a hinge and closes around the wrist. It can be used with a strap or bracelet. The spelling deployment clasp is also common in watch listings.
The face of a watch that presents the time and other indications. Hands, hour markers, apertures, subdials and surface finishes give each dial its appearance and determine how its information is read.
A transparent section in the back of a watch case that allows a view of the movement. It is also called an exhibition caseback. The visible components depend on the movement’s construction.
A function that displays the time in two time zones. The second indication may use an extra hand, a subdial or another display. Check how each time indication is adjusted on the specific watch.
See also GMT · World time
A dial decorated with a glass-based enamel material fused by heat. Techniques can create smooth surfaces, painted scenes or compartments of colour. The maker’s description identifies the process used on a particular dial.
The mechanism that controls the release of energy from the gear train and gives impulses to the regulating system. Its repeated action helps a mechanical watch advance at a controlled rate.
See also Balance wheel · Mechanical movement
A chronograph feature that lets the wearer reset and restart an elapsed-time measurement with one operation while the timer is running. The operating instructions explain which pusher controls the function.
See also Chronograph · Pushers
The rate at which a watch’s regulating system oscillates, often stated in hertz or vibrations per hour for mechanical watches. A rate of 4 Hz corresponds to 28,800 vibrations per hour.
See also Vibrations per hour · Balance wheel
A seller’s description for a watch accompanied by the accessories and documents considered complete for that reference. Contents can vary by brand and year. Request an itemised list of the included box, papers, links and accessories.
See also Box and papers · Provenance · Reference number
A time-zone function commonly using an additional hand that completes one circuit in 24 hours. Depending on the movement, the local-hour hand or the additional time-zone hand may be adjusted independently.
See also Dual time · World time · Bezel
Decorative engraving made from a repeating pattern of intersecting lines or shapes. It is often seen on dials. The watch’s description may specify traditional engine turning, another engraving process or a patterned surface treatment.
See also Dial · Enamel dial
A feature that stops the seconds indication when the crown is moved to the time-setting position. It helps the wearer synchronise the watch with a reference time. Availability depends on the movement.
A mechanical movement whose mainspring is wound by operating the crown. It is also called manual-winding. The winding direction, number of turns and guidance at full wind are specific to the calibre.
See also Automatic · Mainspring · Winding
The study and practice of measuring time and making timekeeping instruments. In watch collecting, the word encompasses movement design, manufacturing, finishing, maintenance and the history of watches and clocks.
See also Movement · Complication
A movement described as developed or manufactured by the watch brand or its group. Usage varies across the industry. The calibre’s documented origin and maker provide more specific information about its production.
The hour markers on a dial. They can take the form of numerals, batons, dots or other shapes, and may be printed or applied as separate components. Index is the singular form.
A bracelet designed to meet the case as a continuous part of its shape, often using a model-specific attachment. Confirm replacement options and included sizing links when evaluating fit or considering a strap change.
A measure of gold purity expressed in parts out of 24. For example, 18-karat gold contains 75 percent gold by mass. A watch’s material description should identify which components use that alloy.
See also Solid gold · Bezel
A condition description generally used for a pre-owned watch with very limited visible signs of use. Interpret the label alongside close-up photographs and the written disclosure of marks, refinishing and included accessories.
The length from the tip of one lug to the opposite lug along the case. This measurement helps explain how a watch spans the wrist, alongside its diameter, thickness and the shape of its lugs.
See also Case diameter · Lugs · Lug width
The distance between the lugs where a strap or bracelet attaches. Usually expressed in millimetres, it helps identify a compatible strap. Also check the attachment design and the manufacturer’s fitting guidance.
See also Lugs · Spring bar · Bracelet
The projections from a watch case that hold the strap or bracelet. Their length, curvature and position influence wrist fit, even when two watches have the same stated case diameter.
See also Lug-to-lug · Lug width · Case diameter
A common term for luminous material on hands, hour markers or other indications. Its type, colour and behaviour vary by age and reference. Inspect the description when comparing original and replacement luminous components.
The coiled spring that stores energy in a mechanical movement. Winding adds energy to the spring, which is released through the gear train as the watch runs.
See also Barrel · Power reserve · Winding
Certification of a finished mechanical watch against METAS requirements. Testing covers performance such as timekeeping, magnetic-field resistance, power reserve and water resistance. Consult the certification information for the specific watch.
See also Chronometer · Anti-magnetic · Water resistance
A movement powered by a mainspring and regulated by a mechanical oscillator. Hand-wound and automatic watches are two forms of mechanical watch, distinguished by how winding energy reaches the mainspring.
See also Automatic · Hand-wound · Escapement
A compact oscillating weight used to wind an automatic movement. It is often set into the movement’s level, allowing a different architecture and view through the caseback from a larger rotor positioned above the movement.
See also Rotor · Automatic · Display caseback
A mechanism that sounds the time on demand, typically using different strikes for hours, quarter-hours and minutes. Controls and operating precautions vary by calibre, so consult the instructions for the individual watch.
See also Complication · Calibre
An indication that represents the changing appearance of the Moon during its lunar cycle. Display designs and adjustment intervals vary. Correct setting depends on the movement and the reference date used.
See also Complication · Perpetual calendar
The mechanism that powers a watch and operates its time display and functions. It may be mechanical or quartz. A named calibre identifies a particular movement design within a manufacturer’s range.
See also Calibre · Mechanical movement · Quartz
A construction or finishing approach that removes selected material to reveal parts of the movement. Skeleton is another common description. The extent of visible mechanics depends on the dial and movement design.
See also Movement · Display caseback · Bridge
Changes in appearance that develop with age, such as shifts in dial, luminous material or metal colour. Collectors assess patina together with originality, condition and clear photographs of the particular watch.
See also Vintage · Lume · Provenance
A calendar mechanism designed to account for month lengths and the usual leap-year cycle while it remains running and correctly set. Many conventional mechanisms require a correction in a non-leap century year such as 2100.
See also Annual calendar · Complication
Refinishing a surface to restore or change its appearance. Work on a watch case or bracelet can affect its contours, brushing and edges. Review photographs and ask about known refinishing when assessing a pre-owned example.
See also Pre-owned · Service history · Provenance
The amount of time a watch can run from its stored energy under specified conditions. A power-reserve indicator displays the remaining energy. Actual running time depends on winding, movement condition and the functions in use.
See also Mainspring · Barrel · Automatic
A watch that has had a previous owner. Evaluate its individual condition, included accessories, documented service history and photographs. Listings may also describe the watch as unworn, Like New or Very Good to explain its condition.
The documented history of a watch’s ownership, origin and significant events. Supporting material can include purchase documents, archives and service records. The strength of the evidence depends on the records available for that particular watch.
See also Box and papers · Serial number · Service history
External buttons used to operate functions such as a chronograph. Some watches also have recessed correctors for calendar settings. Follow the model’s instructions for operation, particularly around water or during calendar-change periods.
See also Chronograph · Flyback · Water resistance
A movement regulated by an electronic circuit and a vibrating quartz crystal. The power source is commonly a battery, although solar and other systems also exist. The display may use hands, digits or both.
See also Movement · Mechanical movement
A split-seconds chronograph that uses two overlapping seconds hands to compare elapsed times. One hand can pause for an intermediate reading and then catch up with the other hand as timing continues.
See also Chronograph · Flyback
A code identifying a watch model or configuration. A reference can distinguish details such as the case material, size or dial. Compare it with the listing, available documents and the watch’s identifying markings.
See also Serial number · Calibre · Box and papers
An indication whose hand travels along a limited arc or scale before returning to its starting position. Depending on the watch, a retrograde display may show the date, day, seconds or another function.
See also Complication · Dial
The oscillating weight that helps wind an automatic movement as the watch moves. Its form and position vary by calibre, from a large centrally mounted rotor to a smaller micro-rotor.
See also Automatic · Micro-rotor · Mainspring
A transparent watch covering made from synthetic sapphire, commonly used above the dial and in display casebacks. Coatings and construction vary. A watch’s specification identifies the crystal material fitted to that reference.
See also Dial · Display caseback · Bezel
A crown that secures to a threaded tube in the case. Its design contributes to the case’s sealing system. Close it according to the maker’s instructions and observe the watch’s stated water-use guidance.
See also Crown · Water resistance
An identifying number associated with an individual watch or component. Its location and format vary by manufacturer. Comparing available markings and documents can help establish the watch’s identity and recorded history.
See also Reference number · Provenance · Box and papers
Records of maintenance and repair carried out on a watch. Useful details include the date, service provider, scope of work and replaced parts. Ask which documents support the history stated in a listing.
See also Provenance · Polishing · Water resistance
A seconds display shown in its own subdial. Its position is determined by the movement and dial design. This separate indication is common on both simple time-only watches and watches with additional functions.
A description indicating that the specified component is made from a gold alloy through its substance. Check the karat and which components are covered by the description, especially when comparing cases, bezels and bracelets.
A small spring-loaded fitting that commonly secures a strap or bracelet between a watch’s lugs. Diameter, length and end shape affect compatibility. Correct fitting is important for keeping the watch secure on the wrist.
A dial finish with fine lines radiating outward, creating changing reflections as the angle of light changes. Colour, texture and the position of the light influence how the dial appears in photographs.
A graduated scale used with a chronograph to calculate a rate over a known unit. A familiar application is average speed after timing one kilometre or mile. The scale may appear on a bezel or dial.
See also Chronograph · Bezel
A lightweight metal used in watch cases, bracelets and other parts. Grades, alloys and surface treatments affect its properties and appearance. Compare the manufacturer’s material specification when evaluating a particular reference.
See also Bracelet · Case diameter
A barrel-shaped case, typically with curved sides and a length greater than its width. Its proportions can make a single diameter measurement less informative, so compare the full case dimensions and wrist photographs.
See also Case diameter · Lug-to-lug
A mechanism that carries the regulating assembly and escapement in a rotating cage. It was developed to address positional rate errors associated with gravity and remains a distinctive example of mechanical watchmaking construction.
See also Balance wheel · Escapement · Mechanical movement
A condition description for a watch represented as having no signs of wear from use. Check the photographs, production details, warranty documentation and any handling marks described by the seller.
See also Like New · Pre-owned · Box and papers
A condition label generally indicating a well-kept watch with visible signs of use. The nature and extent of marks vary between examples. Assess the case, bracelet, crystal and dial using the individual listing and photographs.
The number of half-oscillations made by a mechanical balance in one hour, often shortened to vph. For example, 28,800 vph corresponds to a frequency of 4 Hz.
See also Frequency · Balance wheel
A collecting term for watches from an earlier period. The age threshold varies with context and seller. A vintage watch’s reference, originality, condition and documented history provide more specific information than the label alone.
See also Patina · Provenance · Service history
A tested pressure-resistance specification expressed in units such as bar or metres. Suitable use depends on the watch’s design, instructions and current sealing condition. For a pre-owned watch, ask about recent testing before water exposure.
See also Screw-down crown · Service history · Pushers
The process of storing energy in a mechanical watch’s mainspring. A hand-wound watch uses the crown, while an automatic watch can also obtain winding energy from wrist movement. Follow the instructions for the specific calibre.
See also Hand-wound · Automatic · Power reserve
A display that shows the time across multiple time zones, often using a city ring and a 24-hour scale. Adjustment methods and the handling of daylight-saving time depend on the watch’s design.
See also GMT · Dual time · Complication
COSC chronometer criteria · METAS watch certification · Swiss watch industry water-resistance guidance · FHH mechanical watch fundamentals
Use the glossary while exploring our pre-owned watch guide or watch collection. For a question about a particular reference, contact our team.
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