Watch Glossary

Coiled metal ribbon that stores energy to power the entire watch movement.

Mechanical movement requiring manual winding via the crown to store energy in mainspring.

Measurement of intentional oval gear deviation in equation marchante mechanism

Seiko's hybrid movement combining quartz accuracy with mechanical automatic winding.

Engagement of teeth between two gears; critical for smooth power transmission

Chronometer-grade movement meeting U.S. military specifications for accuracy and shock resistance.

Military specification requiring 1,000+ wind cycles without degradation or brittleness.

Military specification mandating Incabloc or equivalent anti-shock mechanism for durability.

Military specification requiring movement to survive 50G impact without losing chronometer rating.

Caliber requirements for shock resistance, accuracy, and reliability in combat conditions.

Wheel rotating once per hour on cannon pinion, drives hour wheel in motion works

Meca-quartz hybrid, mechanical chronograph with quartz timekeeping, battery powered operation

Specific movement caliber selected and approved by British Ministry of Defence for issue.

Chronograph mounted on base movement, 7750 on 2824 base, allows customization

Watch stored for years with congealed oils; requires full service before operation.

Gear assembly converting center wheel rotation to hour wheel and minute wheel motion

Identifying unique wear signatures on caliber-specific components used to verify authentic movement installation.