Watch Glossary
1356 horological terms explained · 11/23
Luminous material applied to watch hands enabling visibility in darkness
Age-related discoloration of watch hands; varies from subtle to dramatic.
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
Miniature linear actuator providing directional vibration patterns for notifications and 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.
Vertical measurement of raised hemispherical bumps in hobnail pattern, typically 0.2-0.4mm.
Specification for spacing and frequency of hobnail bumps per square millimeter on dial.
Proportional relationship between hobnail dome height and base diameter.
The calculated spherical radius of individual hobnail dome protrusions on dial.
The number of reflective facets per hobnail dome element on dial.
Quantitative measurement of how hobnail facets disperse incident light.
Evaluation of bilateral symmetry in hobnail dome formation across dial.
Raised hemispherical bumps arranged in grid pattern, resembling boot sole studs on dial.
Vintage diving watch case design featuring holes drilled in case back for rapid decompression.
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.
Combined mechanical quartz/automatic movement with discrete smart sensor integration
Software estimating fluid intake needs through heart rate variability and sweat patterns
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