I s it a clock? Is it art? Or is it a mystery?

Discover the Cartier Portico Mystery Clock — the last of only six ever created. Crafted by Cartier’s master clockmaker Maurice Couët in 1925, this extraordinary timepiece stands as a triumph of ingenuity and beauty, where innovation meets illusion.

Inspired by the genius of French illusionist Robert-Houdin, these “mystery” clocks defy the eye: their hands appear to float freely, detached from any visible mechanism. Every element, from its Oriental-inspired temple columns to the exquisite rock crystal Shishigure crowning its top, reflects Cartier’s unparalleled artistry.

Lot

Cartier, Paris

The Shinto Shrine Gate Mystery Clock No. 6 | Completed on 15 June 1925 | A magnificent and important rock crystal, gold, onyx, black enamel, diamond, agate and coral 8-Day Portico Mystery Clock surmounted by a Buddhist Lion

Estimate: 3,000,000 – 5,000,000 CHF

Important Watches Including the Gunter Sachs Cartier Portico Mystery Clock and the Mercedes Gleitze Rolex Oyster

9 November 2025 | 11:00 AM CET | Geneva

Once owned by the legendary Gunter Sachs — art collector, photographer, and husband of Brigitte Bardot — this clock is far more than a timekeeper. It is a symbol of artistic mastery and a milestone in horological history.

This horological masterwork is a highlight of the Important Watches sale taking place at Sotheby's Geneva on 9 November.

Past Auction

Important Watches Including the Gunter Sachs Cartier Portico Mystery Clock and the Mercedes Gleitze Rolex Oyster

9 November 2025 | 11:00 AM CET | Geneva