Watch Glossary

Hand-wound movement, 40-hour power reserve, robust construction for field watches

Hand-wound, 50-hour reserve, reliable workhorse for Prospex line, accurate regulation

Simple automatic, 41-hour reserve, iconic in Submariner homage watches, proven durability

Grand Seiko in-house movement, 72-hour reserve, high accuracy, hand-wound precision

Automatic, 40-hour reserve, hacking seconds, day-date complications, affordable reliability

Seiko's proprietary quartz-mechanical hybrid movement with magnetic braking, eliminating watch tick.

ETA 2824 alternative, 42-hour reserve, Swiss-made, compatible chronograph calibers available

Chronograph movement based on 7750, 42-hour reserve, Swiss manufacture, column wheel

Component that engages intermediate wheel to enable time-setting mode in keyless works

Gear reduction factor establishing sidereal hour hand rotation versus mean solar time

Precision hairspring tension adjustment calibrating sidereal timekeeping accuracy

Annual mechanical adjustment compensating for 20-minute sidereal-tropical year variance

Gear with non-standard tooth count creating cumulative time differential display

Hairspring made from silicon, offering improved precision and resistance to temperature variations.

Watch movement powered directly by solar panels, requiring no battery replacement.

Rolex's silicon hairspring and balance wheel assembly for enhanced chronometric performance.

Patek Philippe's patented hairspring with silicon construction, improving rate stability and temperature compensation.

Seiko's unique technology combining mechanical precision with quartz accuracy using a mainspring.

Seiko proprietary kinetic energy regulation system preventing escapement impulse variations

Software design allowing smartwatch apps to function independently without tethered smartphone

Collector slang for excessive play in the winding stem from worn stem tube; indicates service need.

Mechanical corrector adjusting sunset time display for atmospheric refraction effects

Movement minimum 60% Swiss-manufactured content, Sellita SW200/500, ETA movements qualify

Omega's proprietary silicon hairspring providing superior stability and anti-magnetic properties.