Watch Glossary

Specific model designation of a watch movement, identifying its design and specifications.

Hollow pinion on center wheel shaft that drives minute wheel and hour wheel gearing

Main wheel rotating once per hour, drives minute wheel and hour wheel via cannon pinion

Rolex's escapement system improving efficiency and precision in watches

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

Integrated or modular addition to base movement for stopwatch function, 7750, 8900 examples

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

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.

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

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

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

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

Tapered pivot points reducing bearing friction in movement

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

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

Balance wheel incorporating copper for temperature compensation

Base caliber upon which additional complications are added

Swiss Official Chronometer Testing Institute certification for precision mechanical movements.

Friction device connecting chronograph to main movement when activated

Fine-tuning mechanism for rate adjustment in movement

Cruciform component in escapement connecting to balance wheel

Bridging standard enabling seamless data transfer between smartwatch and smartphone ecosystems

Balance wheel with drum-shaped mass distribution design

Standard rounded pivot point between movement components