While many brands at the SIHH this year recurred to adaptations of pre-existing models, Cartier surprised us with a new watch collection called Clé, named after the key-shaped crown on its case. (Eric Maillet © Cartier)

While many brands at the SIHH this year recurred to adaptations of pre-existing models, Cartier surprised us with a new watch collection called Clé, named after the key-shaped crown on its case. (Eric Maillet © Cartier)