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Glossary of watchmaking

Bezel

Lunette | ベゼル | 表圈

Bezel

A ring around the case middle that secures the crystal.

A rotating bezel records additional information such as the duration of a given phenomenon.

The bezel on a diving watch is unidirectional. This is a deliberate feature and an additional safety factor as the bezel only rotates in the direction that will reduce dive time. Hence if the bezel is accidentally turned, the diver can still surface with sufficient air and respect decompression stops.