Watch Glossary

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

Measurement tracking point-contact wear rate on equation marchante cam surface

Measurement quantifying friction losses in equation marchante cam follower mechanism

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