Watch Glossary

In-house automatic, 70-hour reserve, chronometer certified, used in Atmos clocks

Synthetic ruby or sapphire bearing reducing friction at watch movement pivot points

Total number of synthetic ruby jewel bearings in a movement; more jewels typically reduce friction.

Replacement of synthetic or natural jewel bearings in watch movement

Metal-lined bearing holes that hold synthetic ruby jewels to reduce friction on pivots.

Synthetic ruby or sapphire holes that reduce friction in watch movements through low-friction surfaces

Functional decorative elements on watch movements; historically functional for friction reduction

Synthetic rubies used as low-friction bearings for watch pivots and components.

Jaeger-LeCoultre's ultra-compact automatic movement at 23.2mm diameter, engineered for thin dress watches.

Geneva Hallmark certification applied to JLC movements, guaranteeing Swiss manufacture and quality standards.

English clockmaker who solved the longitude problem with his marine chronometers H1-H5

Five-piece link bracelet with a distinctive curved center link pattern.

Hour numeral or hand advancing discretely at hour transitions rather than continuously.

Hour numeral jumps to the next hour at midnight rather than rotating smoothly, often used with retrograde minutes.