Watch Glossary

Mechanical press tool for installing watch hands with precise alignment and pressure

Edges manually angled and finished by hand for sophisticated look

Manually beveled edges at precise angles for refined appearance

Surface finished by hand using polishing compounds for refined shine

Manual winding required, no automatic rotor, lighter and simpler design, 4R36, 6R35, 240

Installation of new watch hands when original is damaged or worn

Complete assembly of hour, minute, and seconds hands in coordinated design.

Enlarged, contrasting hour hands critical for quick time reading during dives.

Watch collecting emphasizing physical evaluation and appreciation of timepieces over investment

Vintage watches where date changes coincide with hour hand position at midnight.

Miniature vibration motor providing tactile notifications without audible alerts

High-Accuracy Quartz movement achieving annual rates better than ±10 seconds.

High watchmaking; artisanal craftsmanship producing exceptional mechanical timepieces

Heating metal to specific temperatures to alter hardness, strength, and other physical properties.

One-way valve on the case allowing pressurized gas release during decompression.

Condition where helium gas saturates diver tissues during extended deep work.

Gas escape valve used in dive watches to release helium trapped during saturation diving decompression

Acrylic plastic crystal material used in vintage watches; lightweight and prone to scratching

Abbreviation for helium escape valve; critical for deep saturation diving operations.

Mirror-like reflective surface achieved through progressive polishing

Movement with vibration frequency above 28,800 bph for smoother second hand motion.

Case made with hollow sections inside the caseband to reduce weight while maintaining durability.

Lightweight bracelet link with interior space, reducing overall weight.

Bracelet links with interior space, lighter weight and cost-effective construction

Timepiece inspired by or closely resembling another iconic watch design

Dial surface with hexagonal pattern texture resembling honeycomb structure

Fine abrasive machining process achieving smooth surfaces and precise hole diameters.

Parallel horizontal lines creating soft, satin-like surface texture

Relating to the science, study, and art of timekeeping and watch design

Master craftsperson specializing in the design, construction, and repair of clocks and watches

Premium shell leather from Horween tannery, develops deep patina, extremely durable

Indices positioned at hour positions indicating time divisions on dial.

Wheel rotating once per 12 hours, driven by minute wheel via motion works

Green Submariner Date reference 116610LV, named for its vibrant hulking green color.

Exposure of sealed watch to controlled moisture levels to check seal integrity

Pocket watch with hinged metal cover protecting the crystal, favored by hunters and travelers.

Jewel on balance wheel that receives impulses from pallet fork escape wheel

Calibers designed and produced by watch brand, Omega 9300, Seiko 9R65, AP 3120 examples

Watch movement entirely developed and manufactured by the brand itself

Shock-absorption system using jeweled bearings to protect delicate balance staff from impacts.

Seconds mechanism independent from main movement allowing separate regulation and reset function.

Individual horologist or small atelier creating watches outside major manufacture houses

Minimalist hour markers using simple lines or shapes

Integrated multi-axis gyroscope and accelerometer for motion tracking applications

Patek Philippe's integrated bracelet design solid with rounded links

State of bezel insert markings, fading dramatically affects sports watch desirability and value

Bracelet design where the end links flow seamlessly from the lugs without separate attachment.

Chronograph components built into base movement, Zenith El Primero and Omega 9300 examples

Gear wheel engaged by setting lever to allow independent time adjustment

International standard for diver's watches quality, water resistance, and safety requirements

Property where oscillation period remains constant regardless of amplitude or driving force variation

Vulcanized rubber strap with curved lugs, comfort-focused diving watch design

In-house automatic, 70-hour reserve, chronometer certified, used in Atmos clocks

Synthetic ruby or sapphire bearing reducing friction at watch movement pivot points

Total number of synthetic ruby jewel bearings in a movement; more jewels typically reduce friction.

Replacement of synthetic or natural jewel bearings in watch movement

Metal-lined bearing holes that hold synthetic ruby jewels to reduce friction on pivots.

Synthetic ruby or sapphire holes that reduce friction in watch movements through low-friction surfaces

Functional decorative elements on watch movements; historically functional for friction reduction

Synthetic rubies used as low-friction bearings for watch pivots and components.