Watch Glossary

British competition offering substantial reward for solving maritime longitude determination problem

Challenge of determining a ship's east-west position at sea, solved through precise timekeeping

Number of seconds per day a watch runs behind correct time.

Auction house predictive range between low and high estimate reflecting market uncertainty for specific model.

Cellular radio allowing standalone calling, texting, and data without paired smartphone

Adding appropriate lubricants to watch components for smooth mechanical operation

Protruding attachment points on the watch case where bracelets or straps connect.

Terminology describing discomfort when lugs press against wrist bone or surrounding tissue.

Evaluation of whether lugs curve downward excessively beyond natural wrist contour

Evaluation method for assessing lug durability under repetitive bracelet removal stress

Technical review evaluation of lug shape, angle, and curvature affecting comfort.

Historical watchmaking method of partially or fully closing factory lug holes for strap integration.

Measurement scale for how sharply or gently lug horns extend outward from case body

Negative review terminology for cases where lugs extend beyond wrist bone structure.

Journalistic threshold for acceptable lug extension beyond wrist width in reviews

Technical specification detailing the arc radius of case lugs affecting wrist fit.

Review language assessing how securely spring bars hold bracelet end links to case.

Review assessment of how smoothly lugs transition from case middle to end links.

Polishing and erosion visible on case lugs from bracelet friction over time.

Analysis of strap-induced wear patterns on lugs to verify original ownership duration.

Space between the lugs where the strap or bracelet attaches.

Curvature quality and smoothness where lugs meet the main case body

Measurement between watch case attachment points determining wrist fit compatibility

Rating system evaluating how well a watch's end-to-end length suits average wrist dimensions.

Measurement between the inner edges of the lugs, determining strap and bracelet fit on the wrist.

Proportional relationship between lug-to-lug distance and case diameter for wearability assessment

Review assessment of gap between case lugs and wrist, indicating proper fit.

Ideal range of lug-to-lug measurements (typically 48-50mm) for average wrist comfort

Minimum distance between lugs and wrist bone when watch sits naturally on typical wrists

Mathematical calculation of lug extension distance relative to wrist circumference.

Projections on the case that hold the strap or bracelet.

Abbreviation for luminous material applied to hands and markers.

Radioactive or photoluminescent coating on hands and indices for night visibility

Process of applying luminous material to watch dials, hands, and hour markers

Crystalline white haze appearing on vintage radioactive luminous material surface over decades.

Classification of luminous material crystallization patterns visible on aged watch dials.

Initial intensity of luminescence immediately after light exposure before degradation occurs

Luminous fill color; typically green, blue, or white for underwater visibility.

Quality of luminous material to adhere properly to dial surface without peeling or degrading

Visual difference between luminous and non-luminous dial areas visible in darkness

Percentage and area of watch dial, hands, and indices coated with luminous material

Gradual loss of luminescence brightness and duration in watch hands and dials over extended time

Dial coated with luminous material for low-light visibility

Process of filling dial cutouts with luminous material for enhanced visibility and aesthetics

Duration and persistence of a watch's luminous glow, measured in hours of visibility in darkness

Consistency between luminous brightness levels on dial, hands, and markers in darkness

Aged appearance of vintage luminous material showing discoloration, yellowing, or browning over time

Resistance of luminous coatings to fading, degradation, and environmental exposure over time

Area of luminescent material applied to hands for extended visibility in darkness

Applied luminous hour markers on dial, typically rectangular shapes on vintage sports watches

Condition fault where luminous material flakes or peels from dial or hands due to age.

Photograph of a watch taken in darkness showing the glow of luminous materials on dial and hands

Amount of luminous material applied to watch components affecting brightness and durability

Consistent application of luminous coating across dial ensuring even brightness throughout

Advanced luminous material providing superior glow intensity and longer phosphorescence duration.

Hour markers filled with luminescent material enabling nighttime visibility

Seiko's luminous coating providing bright glow and long-lasting luminescence on watch dials

Measure of how brightly and for how long a watch's luminous material glows in darkness

Glow-in-the-dark hour markers and hands enabling underwater visibility in darkness.

Phosphorescent coating on hands and indices enabling visibility in darkness.