Watch Glossary

Mechanical movement with integrated stopwatch function including start, stop, and reset buttons.

Complete servicing of chronograph movement and pusher mechanisms

Chronograph hand drift during timing; normal in vintage mechanical watches.

Traditional chronograph with individual pushers for start, stop, and reset for maximum control.

Chronograph with separate pushers for start/stop and reset functions for easier operation.

High-precision movement certified to meet strict accuracy standards, typically -4/+6 seconds.

Official certification verifying movement accuracy within specific daily rate tolerances.

Precision escapement design using detent mechanism for improved accuracy and lower friction.

High-precision movement meeting COSC standards with chronometer certification, achieving ±-4/+6 seconds accuracy.

Measurement of how accurately a chronometer maintains timekeeping over extended periods

Official COSC certification grade indicating movement precision within specific tolerances

Set of rigorous testing criteria ensuring exceptional timekeeping precision.

Testing of movement rate accuracy to verify chronometer certification standards

Degree to which watch maintains precise and consistent timekeeping.

Standard of accuracy required for movements to be officially certified as chronometer-quality

Concentric circular pattern applied to surface through abrasive finishing

Spring-loaded component that engages the ratchet wheel to prevent backward mainspring rotation.

Enameling technique using thin metal walls to contain and separate colored enamel sections.

The specific tool trajectory used to create burnished pyramids in clous de Paris motif.

Finishing technique polishing raised dot edges while preserving textured surface.

Regular pattern of punched dots creating a raised nail-head texture on dial surfaces.

The sharpness of specular light reflection peaks on clous de Paris pyramids.

Positioning system for punch tool ensuring regular spacing of nail-head dots across dial.

The recessed spacing surface between adjacent clous de Paris pyramid elements.

The keenness of peak points in clous de Paris pyramid relief structures.

Three-dimensional variation of clous pattern with enhanced raised dots for shadow depth.

Measurement of pyramid height variation in clous de Paris guilloché patterns.

Multiple small gemstones grouped together creating unified visual element.

Wheel that couples or decouples train wheels during winding versus timekeeping modes

Modern escapement with concentric design reducing friction and improving chronometer performance.

Co-axial mechanism reducing friction between escapement components for improved accuracy

Spiral-shaped component in the mainspring barrel

Single-sided metal bridge that supports one end of a pivot; commonly used for balance wheel.

Specialized screws securing the balance cock to the movement plate

Interaction between multiple complications affecting overall function

Rate at which case materials expand with temperature changes

Bezel with raised ridges resembling coin milling for grip

Bezel with concentric circular ridges resembling coin edge, providing enhanced grip

Bezel with raised ridged edge resembling coin milling

GMT-Master II with red and black bezel insert, resembling Coca-Cola branding.

Machining technique performed without heat application

Deliberate plan guiding watch acquisitions based on themes, brands, or complications

Small metal tube fixing hairspring to balance wheel staff or collet holder

Precision clamping device for holding small watch components

Draw tube mechanism on precision watch lathes that tightens collets for secure component holding.

Spring-loaded mechanism securing watch crystal to case

Precision tool determining exact metal collet dimensions for secure stone mounting.

Optical instrument used in precision dial finishing verification

Chronograph component controlling start/stop, found in 7750 and 321, superior precision

Specialized dial for commercial diving watch, often with unique printing or design.

Wireless data bridge maintaining seamless watch-to-smartphone real-time communication

Rotating bezel marked with cardinal directions for navigation

Balance wheel designed to maintain accurate rate despite temperature fluctuations

Historical device used to adjust effective hairspring length for rate regulation

Any function beyond basic timekeeping, such as chronograph or annual calendar

Multiple complex functions combined in single timepiece

Substitution of worn or damaged individual watch parts during service

Inward-curved dial surface creating depth illusion

Nested circular patterns on dial creating depth and visual layering.

Decorative pattern of nested circular lines on dial or case