Watch Glossary

Chronograph operated by a single button controlling start, stop, and reset functions sequentially.

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

Complete servicing of chronograph movement and pusher mechanisms

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.

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

Spring-loaded mechanism securing watch crystal to case

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.

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

Multiple circular scales or rings printed concentrically on dial

Case seal capability preventing internal moisture accumulation

Tapered pivot points reducing bearing friction in movement

Metal link joining lug to bracelet or strap attachment point

Historical watch model series emphasizing robust construction

Mechanism maintaining consistent power delivery to the movement throughout the mainspring's unwind.

Mechanism maintaining uniform force delivery to regulating organ

In-house developed and manufactured caliber by manufacturer

Metallic surface on bezel insert for tactile engagement feedback

AI algorithm determining user activity and environmental context to optimize power consumption

Mechanism extending power storage across multiple barrels

Case surface treatment following case shape contours

High-contrast dial design for easy reading underwater in low light conditions.