Watch Glossary
1676 horological terms explained · 2/3
Stationary bezel integrated into the case, non-rotating.
Raised inner ring on the bezel or dial used for measuring elapsed time on chronograph watches.
Gem-setting method where stones sit level with surrounding metal surface.
Rare vintage crown attachment method without threads; press-fitted onto stem for waterproof seal.
Rubber or synthetic seal that creates water-resistant barriers around openings.
Ornate arrangement with central gemstone flanked by pear-shaped stones.
Specialized bezel with 24-hour markings for tracking multiple time zones.
Gemstone held by tiny metal grains raised from base metal surface.
Central gemstone surrounded by smaller diamonds in concentric ring arrangement.
Proportional clearance between chronograph hand tips and bezel inner edge
One-way valve on the case allowing pressurized gas release during decompression.
Gas escape valve used in dive watches to release helium trapped during saturation diving decompression
Abbreviation for helium escape valve; critical for deep saturation diving operations.
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.
Bracelet design where the end links flow seamlessly from the lugs without separate attachment.
Advanced gem-setting technique where support structure remains hidden beneath gemstones.
Crown positioned at 9 o'clock instead of standard 3 o'clock for left-handed watch operation.
Evaluation of whether lugs curve downward excessively beyond natural wrist contour
Measurement scale for how sharply or gently lug horns extend outward from case body
Polishing and erosion visible on case lugs from bracelet friction over time.
Space between the lugs where the strap or bracelet attaches.
Curvature quality and smoothness where lugs meet the main case body
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
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
Projections on the case that hold the strap or bracelet.
Design architecture integrating traditional watch complications with electronic displays
Protective crown housing exceeding standard military specifications to prevent accidental winding.
Decorative beaded metal edge surrounding gem setting, adds visual definition.
Prescribed hardness levels for case metal required under military watch contracts.
Enhanced case sealing technology required by MIL-W specifications achieving 300m+ water resistance.
British military protocol for hermetic caseback closure ensuring pressure resistance.
British military specification requiring sealed caseback to prevent debris infiltration.
Single-piece case construction where the entire case is machined from one solid block of material.
Specification for bezel index positioning and lume application on military-issued timepieces.
Case lug design allowing rapid field replacement of watch band using standard NATO strap system.
Standard specification ensuring replacement bezels fit military-issued watch cases.
Eight-sided case shape providing a geometric, distinctive appearance with flat edges and corners.
Technique covering a surface densely with small diamonds or gemstones, minimizing visible metal.
Case finish with a mirror-like reflective surface achieved through grinding and buffing.
Traditional method securing gemstones using metal fingers extending from bezel base.
Buttons on the case side used to operate chronographs and other functions.
Seals around chronograph pushers to maintain water resistance.
Four-sided case with right angles and straight edges, elongated horizontally or vertically.
Bezel professionally repolished, reducing originality grade and collector value.
Technique where metal beneath gemstone curves upward supporting stone edges.
Case design sealing crystal, case, and back for exceptional water resistance.
Proprietary triple-sealed crown mechanism in Caliber 3135 watches, ensuring exceptional water resistance integrity.
Bezel that rotates in one or both directions for timing purposes.
Case design with applied dial elements creating a layered appearance, often seen in military watches.
Caseback sealed with threads that screw onto the case middle, improving water resistance.
Crown that screws onto the case threads for enhanced water resistance.
Chronograph button secured with a screw for enhanced durability.
Engraved caseback featuring broad arrow, service number, issuance year, and soldier identification.
Rotating bezel on military-issue watches typically featuring elapsed-time scale for field operations.
Case construction where the caseband is machined entirely from solid metal, no hollow sections.
Case design featuring distinct stepped or tiered levels on the sides, creating dimensional appearance.
Precision specification for sunrise-sunset display aperture alignment consistency