Watch Glossary

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.

Measure of how proportionally the hairspring responds to increasing angular displacement.

Fine-tuning method ensuring constant oscillation period regardless of amplitude variance.

Condition where hairspring loses elasticity, causing poor timekeeping especially during acceleration.

Exact axial position where the spring's mass distribution creates minimal precession during rotation.

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

Age-related discoloration of watch hands; varies from subtle to dramatic.

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

Miniature linear actuator providing directional vibration patterns for notifications and alerts

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

Combined mechanical quartz/automatic movement with discrete smart sensor integration