Watch Glossary

Toothed wheel in the winding mechanism that prevents mainspring from unwinding during manual winding.

Proportion of gear teeth determining speed reduction between successive gear stages

Measurable side-to-side movement of the timing lever pin within its mounting point.

Design feature minimizing transmission of external vibrations to the hairspring timing mechanism.

Permissible gap between the regulator pin and the hairspring timing lever contact surface.

Intermediate wheel system providing constant force and regulating energy from the mainspring.

Perpetual rotor, Parachrom hairspring, 48-hour power reserve, widely used in sports watches

Evolved 3135 with Chronergy escapement, 70-hour power reserve, improved efficiency

GMT-Master II exclusive, dual time module, 70-hour reserve, Chronergy escapement

Proprietary automatic winding system in Caliber 3135, featuring bidirectional winding and optimized energy transfer.

Weighted oscillating component in automatic watches that winds the mainspring via wrist motion.