The Watch Encyclopedia

COSC

Also known as: Contrôle Officiel Suisse des Chronomètres

The Swiss organisation certifying chronometer performance through defined tests.

Good to know

COSC movement testing and later testing of a complete watch are distinct scopes.

Watch library

Porsche Design

Porsche Design

Porsche Design

Porsche Design

Tissot

Tissot

Connections use recorded specifications. Features vary by reference.