Watch Glossary
1676 horological terms explained · 6/28
Rolex metric measuring escapement efficiency gains over traditional designs
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.
Condition defect where chronograph hand exhibits slight stiction or lag before continuous sweep motion.
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
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.
Advanced synthetic pallet stone material in Omega co-axial escapement design.
Mechanical coupling methodology between co-axial escapement and seconds hand drive train.
Omega measurement of friction reduction in co-axial escapement vs lever escapement
Specialized setup procedure ensuring concentric alignment of co-axial escapement jewel pairs.
Progressive friction mapping across co-axial escapement pivot bearing surfaces.
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
Controlled resistance created by the hairspring's collet seat on the balance arbor.