Watch Glossary
1676 horological terms explained · 4/28
Official document proving watch movement meets chronometer precision standards
Early luminous compound containing radium, historically used before safer alternatives were developed
Vintage radium-based luminous material formerly used on watches, now obsolete due to radioactivity
Motion analysis software measuring steps-per-minute during running and walking activities
Patek Philippe's classic round dress watch collection established in 1932
Textured leather with preserved animal hair, distinctive pattern and feel
Smooth, fine-grained leather from young cattle, versatile and refined
Specific model designation of a watch movement, identifying its design and specifications.
Jaeger-LeCoultre manual wind movement with deadbeat seconds and high precision
Jaeger-LeCoultre's micro-rotor ultra-thin automatic movement for dress watches
Patek Philippe ultra-thin automatic movement, one of the thinnest in horology at 3.30mm thickness.
Omega's co-axial escapement movement optimized for dive watch reliability
ETA movement widely used by Omega and other Swiss manufacturers as base caliber
Rolex GMT-Master II movement with independent hour hand and Parachrom hairspring
Rolex's iconic perpetual rotor automatic movement with 48-hour power reserve, used in Submariner and GMT-Master II.
Omega's legendary integrated chronograph movement from 1942, now reissued Speedmaster
Rolex's latest in-house movement with Chronergy escapement, ~70hr power reserve
Omega automatic movement used in Seamaster with screw-down rotor bearing
Rolex in-house chronograph movement featuring column wheel and vertical clutch, introduced in Daytona 2000.
Patek Philippe perpetual calendar movement introduced in 2005 with annual calendar
Patek Philippe perpetual calendar movement introducing annual rather than perpetual
Seiko's pioneering automatic chronograph movement from 1969, precursor to modern integrated chronograph designs.
Seiko's heritage movement with manual wind and 40-hour power reserve
Zenith's workhorse automatic chronograph movement with modular design, widely used across luxury brands.
Omega Co-Axial automatic movement with 50-hour power reserve, revolutionizing escapement technology in 2007.
Omega's in-house co-axial chronograph movement with 60-hour power reserve
JLC ultra-thin movement with only 1.64mm height, representing extreme miniaturization in mechanical watchmaking.
Zenith's integrated chronograph movement with column wheel, 36,000 bph
Omega co-axial escapement movement with anti-magnetic properties up to 15,000 gauss
Patek Philippe in-house automatic movement with 48-hour reserve, featuring Gyromax balance and Spiromax hairspring.
Zenith's grand complication movement with minute repeater and perpetual calendar
Seiko's ultra-high frequency automatic movement with 36,000 bph, representing Japanese precision engineering.
Jaeger-LeCoultre legendary chronograph movement with column wheel and flyback function, used in Master Chronograph.
Zenith's flyback chronograph caliber with column wheel and 1/10th second precision
Zenith's integrated chronograph movement with 36,000 bph beat rate and automatic winding system.
Integrated anti-shock system in Swiss movements, protecting balance staff pivots from impact damage.
Designation for specific movement type used in a watch, identifies internal mechanical components
Rolex perpetual rotor mechanism with self-winding precision engineering
JLC technique for minimizing micro-vibration feedback in ultra-thin caliber 240
Seiko Spring Drive movement with kinetic energy regulation and no escapement
Hollow pinion on center wheel shaft that drives minute wheel and hour wheel gearing
Movement condition where center wheel cannon pinion loosens; causes chronograph hand drift.
Heavy-duty cotton fabric strap, casual aesthetic, durable and affordable
Natural rubber material, flexible and durable, used in vintage and modern straps
Carbon fiber or carbon composite dial offering lightweight durability and contemporary appearance
Lightweight composite material used in modern sports and racing watch cases
TAG Heuer's proprietary carbon composite material for lightweight, durable watch cases and components.
TAG Heuer's sports chronograph named after the Carrera Panamericana race
Solid screw-down backs enhance water resistance versus caseback windows.
Transparent watch case back allowing visibility of internal movement and complications
Specialized accessory for case presses designed to properly seat and compress case back gaskets.
Reinforced lug connection point for integrated bracelet attachment.
Width of the watch case measured from lug to lug.
Journalism observation that watches appear larger or smaller on wrist than spec sheet indicates.
Surface treatment of the case: polished, brushed, or combination.
Surface hardening process that hardens outer steel layers while maintaining tough inner core.
Raised edge around the crystal that protects it from impacts.
Metal or alloy used for the case: steel, gold, titanium, or bronze.
Central section of the watch case that houses the dial and movement, between crystal and caseback.
Measurement of how prominently the main case body extends versus lugs and bezel