Watch Glossary
1676 horological terms explained · 14/28
Fine abrasive machining process achieving smooth surfaces and precise hole diameters.
Parallel horizontal lines creating soft, satin-like surface texture
Relating to the science, study, and art of timekeeping and watch design
Master craftsperson specializing in the design, construction, and repair of clocks and watches
Premium shell leather from Horween tannery, develops deep patina, extremely durable
Indices positioned at hour positions indicating time divisions on dial.
Wheel rotating once per 12 hours, driven by minute wheel via motion works
Green Submariner Date reference 116610LV, named for its vibrant hulking green color.
Exposure of sealed watch to controlled moisture levels to check seal integrity
Pocket watch with hinged metal cover protecting the crystal, favored by hunters and travelers.
Combined mechanical quartz/automatic movement with discrete smart sensor integration
Software estimating fluid intake needs through heart rate variability and sweat patterns
Differential pressure measurement between relief valve opening and closing points in case press
Jewel on balance wheel that receives impulses from pallet fork escape wheel
Calibers designed and produced by watch brand, Omega 9300, Seiko 9R65, AP 3120 examples
Watch movement entirely developed and manufactured by the brand itself
Shock-absorption system using jeweled bearings to protect delicate balance staff from impacts.
Seconds mechanism independent from main movement allowing separate regulation and reset function.
Individual horologist or small atelier creating watches outside major manufacture houses
Minimalist hour markers using simple lines or shapes
Bilateral balance requirement of index regulator arms to prevent chronometric asymmetry.
Engineering technique removing mechanical play between index regulator components.
Mechanical resistance required to move index regulator arms during timing adjustment.
Total achievable rate correction span via index regulator adjustment before mechanical limits.
Numerical value representing resistance between the regulator pin and the hairspring lever.
Lag between index regulator movement command and actual hairspring length adjustment.
Rotational force required to move the timing lever from a fixed regulator pin position.
Critical measurement of the semicircular grooves on the regulator pin engagement surface.
Centered mechanical state of index regulator where hairspring length correction equals zero.
Thread specification controlling fine adjustment increments on index regulator mechanisms.
Examination of regulator pin surface abrasion to assess timing lever contact consistency.
Integrated multi-axis gyroscope and accelerometer for motion tracking applications
Patek Philippe's integrated bracelet design solid with rounded links
State of bezel insert markings, fading dramatically affects sports watch desirability and value
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
Zenith measurement of how column wheel integration affects rotor moment calculations
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.