Watch Glossary
1104 horological terms explained · 2/3
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.
Integrated or modular addition to base movement for stopwatch function, 7750, 8900 examples
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
Draw tube mechanism on precision watch lathes that tightens collets for secure component holding.
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