Cartier Clé 40 mm
The Clé is a wristwatch by Cartier.
This is the 40 mm (large) version in the Clé range. The watch is equipped with the self-winding manufacture movement 1847 MC.
The name Clé derives from the unusually novel key shaped crown, set with a blue synthetic spinel. The normal position of this key is concordant to the case. When twisted, it allows to set the time and the date.