Timeless Ticks
Watch glossary
Every term a watch listing, a spec sheet or a watchmaker might throw at you, defined in plain language and linked to the pages that use it.
60 definitions. Every definition is checked against a published standard or manufacturer documentation.
Watchmaking has an unusually large vocabulary and about half of it is used loosely in shop windows and listings. Each entry opens with a one-sentence definition you can act on, then explains what the term actually describes, what the normal values are, how you meet it in practice, and which nearby term it is most often confused with.
The rest of the site links these entries automatically the first time a page uses one, so you can read a guide without keeping a second tab open.
A
- AmplitudeAmplitude is how far a watch balance wheel swings, measured in degrees. What a healthy reading looks like, and why watchmakers che
- AnglageAnglage is the bevelled, polished edge on movement parts. How it is done, what it costs in bench time, and how to tell hand work f
- Automatic windingAutomatic winding uses a rotor turned by wrist motion to wind the mainspring. How the system works, what it cannot do, and when to
B
- Balance wheelThe balance wheel is the timekeeping oscillator of a mechanical watch. What it does, how frequency is set, and what regulation act
- BarrelThe barrel is the toothed drum that houses a watch's mainspring. What it does, how it sets the power reserve, and why torque falls
- Beat errorBeat error is the timing difference between a balance wheel's two half swings, in milliseconds. What counts as good, what causes i
- BezelThe bezel is the ring that retains a watch crystal, fixed or rotating. What the different types do, and why a dive bezel turns onl
C
- CaliberA caliber is a specific watch movement design, identified by maker and number. How to read one, what base and modified calibers me
- Cannon pinionThe cannon pinion is the friction-fitted tube that drives the minute hand. Why that friction fit lets you set the time, and what a
- Chapter ringWhat a chapter ring is, why misalignment happens, and how much it should actually influence a buying decision.
- ChronographA chronograph is a watch with a built-in stopwatch. How the pushers, clutch and column wheel work, and why it is not the same as a
- ChronometerA chronometer is a watch certified to a precision standard, most often by COSC. What the test involves, what the tolerances are, a
- Co-axial escapementWhat a co-axial escapement is, how it differs from the Swiss lever, and what lower friction actually buys the owner of an Omega.
- ComplicationA complication is any watch function beyond telling the time. What counts as one, how they are grouped, and what they cost in mone
- Cotes de GeneveCotes de Geneve, or Geneva stripes, is the striped finish on movement bridges and rotors. How it is applied, and why the name prom
- CrownThe crown is the knob used to wind and set a watch. What each pulled-out position does, how screw-down crowns seal, and how to use
- CrystalThe crystal is the transparent cover over a watch dial. Sapphire, mineral and acrylic compared on hardness, shatter resistance and
D
E
- EbaucheWhat an ebauche is, how the Swiss industry was built on them, and what it means when a brand says the movement is its own.
- Eco-DriveHow Citizen's Eco-Drive works, how much light it needs, how long the storage cell lasts and how it compares with a normal quartz w
- EscapementThe escapement locks the gear train and impulses the balance. How the Swiss lever works, what alternatives exist, and why it defin
- Exhibition casebackAn exhibition caseback is a transparent back that shows the movement. What it reveals, what it costs in practice, and how to judge
F
G
H
- Hacking secondsHacking seconds stops the balance when the crown is pulled, so the seconds hand halts. How the lever works and why its absence is
- HairspringThe hairspring is the fine coiled spring that governs a watch's rate. Materials, overcoils and why magnetism makes a watch suddenl
- Helium escape valveA helium escape valve vents gas after saturation diving. Why it exists, why almost no owner will ever need one, and what it does n
I
- In-house movementAn in-house movement is a caliber designed and built by the brand selling the watch. What the claim covers, what it does not, and
- Integrated braceletWhat an integrated bracelet is, why it changes how a watch wears, and the strap problem that comes with it.
- IsochronismIsochronism is an oscillator keeping the same rate whatever its amplitude. Why a watch drifts as the mainspring runs down, and wha
J
K
L
- Lift angleWhat lift angle means, why a timing machine needs it, and how the wrong figure makes an amplitude reading meaningless.
- Lug-to-lugLug-to-lug is the tip-to-tip length of a watch case and the dimension that decides fit. How to measure it, and why diameter matter
- LumeLume is the luminous material on watch hands and markers. How modern photoluminescent pigment works, how it differs from tritium t
M
- MainspringThe mainspring is the coiled ribbon that powers a mechanical watch. How it stores energy, why its torque falls, and what that does
- Manual windingA manual winding watch is wound only by the crown, with no rotor. How to wind one properly, why they are thinner, and whether over
- ManufactureWhat manufacture means when a brand uses the word, what it does not guarantee, and how to tell how much of a watch a company reall
- Master ChronometerWhat Master Chronometer certification tests, how METAS differs from COSC, and why testing the cased watch matters more than testin
- Micro-adjustment claspWhat a micro-adjustment clasp does, the systems and increments brands use, how to set one up, and why it matters more than link co
- MoonphaseA moonphase shows the current phase of the Moon. How the standard 59-tooth wheel works, how far it drifts, and what high-precision
N
P
Q
R
S
- Sapphire crystalA sapphire crystal is a synthetic corundum watch glass, Mohs 9 and hard to scratch. How it compares with acrylic and mineral, and
- Screw-down crownA screw-down crown threads shut onto a gasket to seal the case. Why the water resistance rating is void if it is left unscrewed, a
- Shock resistanceShock resistance is standardized by ISO 1413. What the test involves, how Incabloc and KIF settings protect the balance staff, and
- Silicon hairspringWhat a silicon hairspring is, why it is immune to magnetism, and the trade-offs a watchmaker faces when one needs replacing.
- Skeleton dialA skeleton dial is cut away so the movement shows through the front. How it differs from a skeletonised movement, and what it cost
- Spring DriveHow Seiko's Spring Drive works, why the seconds hand glides instead of ticking, and what it means for accuracy and repair.