Watch Glossary

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

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.

Outward-bulging sapphire or mineral glass cover lens

Balance wheel incorporating copper for temperature compensation

Durable synthetic fabric strap with reinforced weave, resistant to abrasion

Base caliber upon which additional complications are added

Elongated curved horn-shaped lug design for comfort

Rounded rectangular case shape with integrated lugs

Rolex crown logo with distinctive coronet design, trademark of the brand.

Protective coating preventing oxidation of metal components

Contrôle Officiel Suisse des Chronomètres - Swiss official chronometer testing institute

Swiss Official Chronometer Testing Institute certification for precision mechanical movements.

Chronometer standard: -4 to +6 seconds per day maximum variation.

Extreme altitude testing verifying chronometer performance stability

Traditional decoration of parallel lines on watch movements, hallmark of Geneva watchmaking.

Geneva stripes; parallel lines decorating watch movement surfaces for aesthetic finish

Bezel with numbers increasing from zero for elapsed time tracking

Secondary subdial displaying alternative time or function measurement

Tool measuring subdial counter positioning and spacing accuracy

Chronograph integrated with main timekeeping mechanism sharing components

Friction device connecting chronograph to main movement when activated

Fine-tuning mechanism for rate adjustment in movement