Cartier's hallmark blue sapphire on the crown has not been excluded and has been fitted inside the rounded contours of the rectangle case. To adjust the time, the key can be pulled out and turned to the accompaniment of a reassuring click. (Eric Maillet ©

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Cartier's hallmark blue sapphire on the crown has not been excluded and has been fitted inside the rounded contours of the rectangle case. To adjust the time, the key can be pulled out and turned to the accompaniment of a reassuring click. (Eric Maillet ©

Cartier's hallmark blue sapphire on the crown has not been excluded and has been fitted inside the rounded contours of the rectangle case. To adjust the time, the key can be pulled out and turned to the accompaniment of a reassuring click. (Eric Maillet © Cartier)

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