Watch Glossary

Engraved caseback featuring broad arrow, service number, issuance year, and soldier identification.

Quoted price for watch repair and maintenance work before authorization

Replacement dial installed during Rolex service, potentially reducing watch value.

Documentation establishing authenticity and sourcing of historically replaced dials.

Record keeping of all service performed with dates and parts replaced

Records of professional maintenance and repairs performed on the watch over its lifetime

Auction term for letters, receipts, and service records proving professional maintenance chain.

Manufacturer-recommended timeframe for professional maintenance and movement inspection

Rotating bezel on military-issue watches typically featuring elapsed-time scale for field operations.

Component that engages intermediate wheel to enable time-setting mode in keyless works

Stingray leather with unique bumpy texture, water-resistant, premium material

Solid metal mesh band with interlocking design, secure and modern aesthetic

Premium horsehide leather from shell area, develops rich patina over time

Verification of watch ability to withstand impact and vibration damage

Bombarding surface with small spheres to increase strength and texture

Mathematical ratio compensating for Earth's axial rotation versus solar day variance

Angular offset between sidereal hour hand and mean solar time hand positions

Gear reduction factor establishing sidereal hour hand rotation versus mean solar time

Precision hairspring tension adjustment calibrating sidereal timekeeping accuracy

Time measured by the Earth's rotation relative to stars rather than the sun.

Annual mechanical adjustment compensating for 20-minute sidereal-tropical year variance

Gear with non-standard tooth count creating cumulative time differential display

Salon International de la Haute Horlogerie; Geneva luxury watch exhibition held annually

Hairspring made from silicon, offering improved precision and resistance to temperature variations.

Soft, flexible rubber strap, hypoallergenic, easy to clean, casual wear

Transparent dial exposing internal movement and bridges for aesthetic display.

Transparent or open-back watch displaying internal mechanisms and movement components visibly.

Thermal sensor measuring core body temperature via wrist surface variance analysis

Software that analyzes REM, light, and deep sleep cycles via motion and heart rate data

Advanced accelerometer differentiating REM, light, and deep sleep phases

Rotating bezel with logarithmic scale for mathematical calculations

Electronic wristwatch integrating digital features, notifications, and smartphone connectivity.

Polished bezel without texture or ridges for sleek appearance

Spiral swirl pattern resembling snail shell appearance

Concentric circular pattern created on watch components resembling snail shells.

Distinctive snowflake-shaped hour markers found on Sea-Dweller models.

Watch movement powered directly by solar panels, requiring no battery replacement.

Dial indication showing simultaneous sun-time and star-time for astronomical accuracy

Case construction where the caseband is machined entirely from solid metal, no hollow sections.

Solid metal links connecting band to case, versus hollow bracelet end links.

Bracelet link constructed from a single solid piece of metal.

Bracelet links that are completely filled, heavier and more durable than hollow

Chiming mechanism that strikes the hours and sometimes quarters automatically at set times.

Collector slang for recently released limited edition purchased primarily for resale appreciation.

Omega's legendary chronograph, the first watch worn on the Moon in 1969

Dial with radial cracks emanating from center, resembling spider web pattern

Rare vintage dial design featuring radial lines emanating from center like web.

Network of micro-fractures in dial enamel creating web-like appearance.

Axial and radial deviation of lathe spindle rotation affecting precision of turned watch components.

Calibration procedure for correcting lathe spindle eccentricity in precision component turning

Rolex's silicon hairspring and balance wheel assembly for enhanced chronometric performance.

Patek Philippe's patented hairspring with silicon construction, improving rate stability and temperature compensation.

Chronograph with two independent hands allowing measurement of two simultaneous time intervals.

Durable watch designed for athletic activities with enhanced water resistance and readability.

Specialized tool for removing and installing spring bars that attach watch straps

Seiko's unique technology combining mechanical precision with quartz accuracy using a mainspring.

Seiko proprietary kinetic energy regulation system preventing escapement impulse variations

Specialized steel alloy used in hairsprings and mainsprings for its elasticity and durability

Corrosion-resistant iron alloy containing chromium and nickel, standard watchcase material

High-grade corrosion-resistant steel alloy with superior polishing and durability characteristics.