Watch Glossary

Container holding the mainspring that stores and releases energy to power the watch

French for house; prestigious watchmaking company with heritage and identity

Highly accurate navigation instrument used aboard ships to determine longitude at sea.

Collector terminology for period when oversized dial indices became manufacturing standard.

Average solar day length used as standard for watch regulation before atomic time

Submariner depth rating printed as meters before feet, rare vintage dial variant.

Rate variation at intermediate temperatures despite compensation mechanisms

Military Submariner issued to armed forces, featuring lollipop dial and dial printing variations.

Watch officially issued by British Ministry of Defence to military personnel for field operations.

Official record documenting authorized changes to military-issue watches during service life maintenance.

Marking applied to watches serviced through official British military maintenance channels.

Physical property of balance wheel oscillation that enables continuous operation without external intervention

Omega Speedmaster Professional, official NASA moon landing chronograph from Apollo missions.