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

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

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