Watch Glossary
1104 horological terms explained
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Batman GMTHistory
GMT-Master II with black and blue bezel insert, resembling Batman's color palette.
Bimetallic balanceHistory
Balance wheel made of two different metals to automatically compensate for temperature changes
Breguet spiralHistory
Hairspring with specially shaped terminal curve invented by Abraham-Louis Breguet for improved chronometry
Broad Arrow AuthenticationHistory
Verification process confirming genuine Crown military issuance by examining hallmark placement and stamps.
Broad Arrow MarkHistory
British military property mark denoting Crown ownership; stamped on case back or dial of service watches.
Broad Arrow ProvenanceHistory
Authentication marker establishing military issuance history through official Crown ownership symbols.