Glossary of watchmaking

Onyx

Onyx

A black agate that is often found as watch dials.

Terms with the same letter

Observatory chronometer Official rating certificate Oignon (watch) Oil sink Oiling Onyx Opale Opaque Organic Orient Ornamental gems Oscillating pinion Oscillating weight (Rotor) Oscillation Oscillator Oval

C C

A wheel with alternating notches and raised portions which controls the number of hours struck.

In a lever escapement, the dart is fixed to a block at the base of the fork.