Watch Glossary

Two mainsprings in series, increases power reserve, common in chronograph movements like 9300

Citizen's light-powered technology using any light source to charge the watch indefinitely.

Small pinion on escape wheel shaft that meshes with lever or pallet fork

Toothed wheel that delivers impulses to the balance wheel via pallet fork

Number of escape wheel teeth engaged per hour; defines movement speed and accuracy rating.

Mechanism that releases energy from the mainspring in precise, regulated pulses.

Energy transfer ratio from mainspring to oscillator, improved in Co-Axial and Chronergy

Toothed wheel in the escapement mechanism that interacts with the lever to release energy.

Ubiquitous workhorse movement, 38-hour reserve, automatic, reliable and affordable

Legendary chronograph movement, column wheel, 42-hour reserve, widely used by luxury brands

Wireless system uploading software patches directly to wristwatch without dock connection

Number of oscillations per hour; determines movement precision and commonly rated in Hz.

Historical mechanism using a tapering cone to maintain constant torque as mainspring unwinds.

Series of interconnected gears that transmit and regulate energy throughout the movement.

Software processing arm movements to trigger watch functions without screen interaction

Specialized movement with independent hour hand for tracking second time zone simultaneously.

German military requirement for co-axial or chronometer escapement in precision military timepieces.

Second hand stops when crown pulled, enables precise synchronization, common in field watches

Delicate spiral spring attached to the balance wheel that controls its oscillation rate.

Fixed point anchoring one end of hairspring to balance cock or balance wheel

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

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

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

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

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

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

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

Gear wheel engaged by setting lever to allow independent time adjustment

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.

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

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

Mechanical system allowing crown to wind mainspring and set time without key

Swiss-made shock absorption system protecting pivots from mechanical damage and vibration.

Seiko's electromechanical movement converting automatic winding energy into electrical power.

Chronograph movement, hand-wound, 50-hour reserve, Swiss precision for military watches

Component in the escapement mechanism that controls the release of energy to the balance.

Type of escapement using pallet fork and lever to regulate energy release to balance

Coiled metal ribbon that stores energy to power the entire watch movement.

Mechanical movement requiring manual winding via the crown to store energy in mainspring.

Seiko's hybrid movement combining quartz accuracy with mechanical automatic winding.

Engagement of teeth between two gears; critical for smooth power transmission

Chronometer-grade movement meeting U.S. military specifications for accuracy and shock resistance.

Military specification requiring movement to survive 50G impact without losing chronometer rating.

Wheel rotating once per hour on cannon pinion, drives hour wheel in motion works

Meca-quartz hybrid, mechanical chronograph with quartz timekeeping, battery powered operation

Chronograph mounted on base movement, 7750 on 2824 base, allows customization

Gear assembly converting center wheel rotation to hour wheel and minute wheel motion

Rolex's modern shock absorber protecting the balance wheel from impacts and vibrations.

Historic movement used in Speedmaster Professional, column wheel chronograph, hand-wound

In-house movement, dual barrels, 60-hour reserve, integrated chronograph mechanism

Master Chronometer certified, antimagnetic, 60-hour power reserve, chronograph capability

The balance wheel and hairspring assembly that regulates the watch's timekeeping rate.

Component that engages escape wheel teeth to control gear train release

Jewel on pallet fork engaging escape wheel teeth for impulse transmission

Rolex's blue alloy hairspring resisting temperature changes and magnetic fields effectively.

Rolex innovation, paramagnetic alloy, temperature resistant, used in 3135 and 3235

Alloys resistant to magnetism, Parachrom hairspring in Rolex, alloy balance wheels