Watch Glossary

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.

Patek Philippe ultra-thin automatic movement, one of the thinnest in horology at 3.30mm thickness.

Rolex's iconic perpetual rotor automatic movement with 48-hour power reserve, used in Submariner and GMT-Master II.

Rolex in-house chronograph movement featuring column wheel and vertical clutch, introduced in Daytona 2000.

Seiko's pioneering automatic chronograph movement from 1969, precursor to modern integrated chronograph designs.

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.

JLC ultra-thin movement with only 1.64mm height, representing extreme miniaturization in mechanical watchmaking.

Patek Philippe in-house automatic movement with 48-hour reserve, featuring Gyromax balance and Spiromax hairspring.

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 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

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.

Review analysis of case body width relative to lug-to-lug measurement.

Manufacturing code engraved on watch case back, sometimes differs from serial number

Tool designed to safely open and close watch cases without damage

Pressurized fluid system in case presses that generates controlled force for crystal and case back sealing.

Electronic force sensor in modern case presses providing digital readout of applied pressure values.

Calibrated manometer on case presses indicating applied force in tons or kilograms during assembly.

Subjective ranking of how boldly a watch's thickness projects from wrist surface.

Vintage watchmaking technique of hand-stamping serial numbers and hallmarks directly into case metal.

Polishing or brushing watch case to restore original appearance and remove damage

Application of sealant compounds to ensure water resistance and dust protection

Metal fatigue condition where case lugs gradually deform outward from repeated bracelet stress.

Height of the watch case from caseback to crystal.

Visible signs of use on watch case including scratches, dents, and polishing marks

Cover plate on the back of the case, removable or fixed.

Custom text or designs etched onto the back cover of the case.

Specialized artisan or manufacturer producing watch cases from precious metals

Tool used to safely open and close screw-down case backs without damage

Dial representation showing positions of stars, constellations, and celestial bodies.

Main wheel rotating once per hour, drives minute wheel and hour wheel via cannon pinion

Rolex ceramic bezel insert technology offering scratch and fade resistance with color permanence.