Watch Glossary
1356 horological terms explained · 12/23
Bracelet design where the end links flow seamlessly from the lugs without separate attachment.
Review terminology for how bracelet curves and flows along wrist contours.
Chronograph components built into base movement, Zenith El Primero and Omega 9300 examples
Gear wheel engaged by setting lever to allow independent time adjustment
Advanced gem-setting technique where support structure remains hidden beneath gemstones.
International standard for diver's watches quality, water resistance, and safety requirements
Property where oscillation period remains constant regardless of amplitude or driving force variation
Vulcanized rubber strap with curved lugs, comfort-focused diving watch design
In-house automatic, 70-hour reserve, chronometer certified, used in Atmos clocks
Synthetic ruby or sapphire bearing reducing friction at watch movement pivot points
Total number of synthetic ruby jewel bearings in a movement; more jewels typically reduce friction.
Replacement of synthetic or natural jewel bearings in watch movement
Metal-lined bearing holes that hold synthetic ruby jewels to reduce friction on pivots.
Synthetic ruby or sapphire holes that reduce friction in watch movements through low-friction surfaces
Functional decorative elements on watch movements; historically functional for friction reduction
Synthetic rubies used as low-friction bearings for watch pivots and components.
Jaeger-LeCoultre's ultra-compact automatic movement at 23.2mm diameter, engineered for thin dress watches.
Geneva Hallmark certification applied to JLC movements, guaranteeing Swiss manufacture and quality standards.
English clockmaker who solved the longitude problem with his marine chronometers H1-H5
Five-piece link bracelet with a distinctive curved center link pattern.
Hour numeral or hand advancing discretely at hour transitions rather than continuously.
Hour numeral jumps to the next hour at midnight rather than rotating smoothly, often used with retrograde minutes.
Lightweight, durable leather with natural elasticity and unique grain pattern
Rotating cage carrying escapement and balance wheel, precursor to tourbillon design.
Small loop on a strap that holds the excess strap length in place.
Rolex GMT-Master II with green aluminum bezel released in 2005
Green Submariner with green bezel, nicknamed after Kermit the Frog character.
High-strength synthetic fiber strap, lightweight and heat-resistant material
Mechanical system allowing crown to wind mainspring and set time without key
Swiss-made shock absorption system protecting pivots from mechanical damage and vibration.
Seiko's electromechanical movement converting automatic winding energy into electrical power.
Rolex's specialized 5N rose gold alloy offering superior hardness and color retention properties.
Watch requiring buyer assembly from pre-made components; common in microbrands
Creating textured ridged patterns on metal surfaces for improved grip on watch components.
Thin protective coating providing glossy finish and enhanced durability.
High-gloss protective coating applied to dial surface creating deep, reflective finish
Parallel link design resembling a ladder, lightweight and comfortable fit
Precision grinding process using abrasive compounds to achieve exact dimensional tolerances.
Precision welding technique using lasers for delicate watch case and component repairs
Chronograph clutch mechanism engaging laterally to connect or disconnect the seconds wheel.
Measurement of geometric accuracy and flatness of a watchmaking lathe's supporting bed structure.
Replaceable gripping element in watch lathe chucks that holds components during turning operations.
Support bearing assembly on watchmaking lathes preventing component deflection during precision turning.
Graduated reference wheel on watchmaking lathes for precise pitch control during screw cutting operations.
Leather strap with traditional buckle closure, classic formal appearance
Leather variant of NATO strap, combines durability with refined appearance
Natural or synthetic material used for classic dress watch bracelets
Hybrid strap with rubber exterior and leather backing, combines durability and style
Crown positioned at 9 o'clock instead of standard 3 o'clock for left-handed watch operation.
Chronograph movement, hand-wound, 50-hour reserve, Swiss precision for military watches
Component in the escapement mechanism that controls the release of energy to the balance.
Type of escapement using pallet fork and lever to regulate energy release to balance
Degree of engagement between escapement and balance wheel at impulse.
Watch produced in restricted quantities, often numbered and highly sought by collectors.
The height variation of surface undulation in linen-pattern guillochage.
Accuracy of interwoven cross-hatch pattern formation in linen guillochage.
Standard spacing distance between linen weave lines, typically 1.5mm increments.
Modern guillochage method mimicking natural linen textile surface appearance.
Fine linear pattern resembling fabric linen texture
The repeating cycle length of linen weave pattern unit cells.