Watch Glossary

Minute repeater chiming hours, quarter hours, and minutes when respective pushers are activated individually.

Displays tidal information based on lunar cycles, useful for maritime and sailing activities.

Dial with distinctive turquoise/Tiffany blue color, iconic Rolex collectible variant.

Tool that analyzes watch beat, amplitude, and rate in real-time.

Maximum allowed variation in seconds per day certified by COSC standards

Fixed outer bezel marking specific time intervals for dive planning.

Electronic device that measures watch rate and performance parameters.

Reference standard component used to verify accuracy and sensitivity of timing machine sensors.

Digital circuit in timing machines measuring escapement frequency in oscillations per hour with precision.

Multiple electromagnetic or optical sensors in timing machines that detect and measure balance wheel vibrations.

Lightweight, hypoallergenic metal alloy offering excellent strength and corrosion resistance

Lightweight metal bracelet, superior strength-to-weight ratio, hypoallergenic

Medical-grade titanium alloy offering superior strength-to-weight ratio and hypoallergenic properties.

Barrel-shaped case wider at the center and tapered at the lugs, resembling a wine barrel.

Robust, functional watch designed for professional or demanding work conditions

Shape of gear teeth affecting smoothness and efficiency of power transmission

Buffed leather layer below full-grain, smooth finish, moderate durability

Mechanism encasing the balance wheel assembly in rotating cage to counteract gravity effects.

Dial design between major production eras, combining features of both generations.

Three gasket seals providing maximum water protection on diver's watches.

Rolex's triple waterproofing crown system for deep diving watches

Radioactive luminous material used in watch dials from 1960s-1990s, safer than radium

Gradual reduction in luminescence brightness of tritium-based watch dials at approximately 5.5% per year

Dial coated with tritium, a radioactive hydrogen isotope providing continuous glow without light exposure

Radioactive luminous material used in vintage watches, glows without recharging.

Sealed glass or metal tube filled with tritium gas used for constant watch dial luminescence

Rubber strap with drainage holes, ideal for water sports and humid conditions

Vintage dial with distinctive brown patina from age and UV exposure

Luminous material that faded from original bright white or cream to warm brownish tones

Seconds hand that advances in one-second jumps at specific intervals, also called dead beat.

Barrel polishing process tumbling watch parts with abrasive media for uniform finishing.

Rolex's double waterproofing system for the crown protecting the watch

Case design consisting of a case middle and caseback, with the crystal fitted into the middle.

Separate sections for each side of watch, allows easy change and cleaning

Mixed metal bracelet combining gold and stainless steel for hybrid aesthetic

Minimalist collecting approach; typically one dress and one sports watch

High-precision positioning technology enabling spatial awareness and proximity detection

High-frequency sound waves used to remove dirt and debris from watch components

Bezel rotating only counterclockwise to prevent accidental advancement.

Rotating bezel designed to rotate only counterclockwise for safety

Watch case retaining original brushed finish without refinishing, highly valued on vintage watches

Swiss chronograph movement, column wheel, 42-hour reserve, basis for many luxury chronographs

Hook-and-loop fastening system, quick adjustment, sporty design

Early escapement mechanism using a rotating verge to regulate energy release from mainspring

Fine linear scratches applied in vertical direction for matte appearance

Chronograph clutch mechanism engaging vertically, also called cam-follower or friction clutch.

Mechanical finishing using vibrating equipment with abrasive media for deburring and polishing.

Aged leather developed patina and character through intentional or natural weathering

Original luminous coatings from older watch era, often radioactive and subject to patination

Natural aging process causing color changes and degradation in old radioactive watch lume over decades

Collectible timepiece typically over 20 years old, valued for historical significance and rarity.

On-device audio processing enabling voice commands without cloud transmission

Heat-bonded rubber material creating durable, flexible, and water-resistant straps

British military designation on dial indicating 10-day power reserve requirement for issued timepieces.

Grid-pattern embossed dial surface resembling waffle texture for enhanced visual interest

Moving hour numeral circling dial rather than traditional rotating hand mechanism.

Complication where hours appear in a rotating disc window, moving horizontally across the dial.

Documentation proving authenticity and purchase date; essential for manufacturer coverage

Guarantee period provided on watch repairs and service work performed

Major international watch exhibition in Geneva; successor to SIHH and Baselworld