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

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.

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

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

Reinforced lug connection point for integrated bracelet attachment.

Width of the watch case measured from lug to lug.

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.

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

Tool designed to safely open and close watch cases without damage

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

Application of sealant compounds to ensure water resistance and dust protection

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.

Ceramic-based protective coating used on watch components for enhanced durability and corrosion resistance

Ceramic insert bezel technology providing superior scratch and fade resistance.

Hard, scratch-resistant material used for bezels, case inserts, and dial elements

Highly scratch-resistant bezel insert made from advanced ceramic materials for durability.

Watch bracelet made from ceramic, hypoallergenic, scratch-resistant, lightweight

High-tech ceramic material used for watch cases, providing scratch resistance and thermal stability.

Durable scratch-resistant material inlaid in rotating bezel

Watches pushed to extreme depths beyond normal certification limits.

Precisely beveled watch attachment points for refined appearance

Cutting beveled edges on components to eliminate sharp corners and improve aesthetics.

Decoration technique where designs are engraved and filled with enamel or contrasting materials.

Enameling technique where design areas are recessed into metal then filled with colored enamel.

Separate ring containing hour markers applied to dial surface

Duration of light exposure required for photoluminescent materials to achieve maximum brightness

Creating repetitive diamond or square grid pattern on watch surfaces for tactile texture.

Rolex's proprietary luminous material providing blue glow and superior visibility in darkness.

Hard chrome coating process providing extreme hardness and mirror-like reflective finish.

Rolex's escapement system improving efficiency and precision in watches

Rolex innovation, improved efficiency over standard escapement, reduces friction and wear

Complication allowing precise measurement of elapsed time with start, stop, and reset functions via pushers.

Chronograph feature allowing single-button reset while running, then immediate restart.

Integrated stopwatch mechanism allowing precise timing of elapsed intervals independently.

Multiple chronograph hands pivoting from center of dial for simultaneous event timing.