Caligula is a heady dose of Jacob & Co over-the-topness – packed into a 45-millimetre-diameter timepiece. Falsely demure, truly complex, it’s an ode to the art of watchmaking subtlety, showcasing guilloche and jewel settings on an expansive dial beneath two openwork leaf hands. At twelve o’clock, a secret window activated by a second pusher reveals a concealed erotic scene – for the (indiscreet) eyes of its owner only.

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