Cartier Mystery Clock (1924)

Case is 220mm height, 105mm depth and 185mm width, rock crystal, agate, nephrite, diamond, rose quartz, onyx, turquoise, seed pearl, mother-of-pearl, yellow gold and enamel. Manual key-wind calibre EWC&Co, jeweled. Case signed, movement signed EWC&Co. Case No 919, circa 1924. Accompanied by Cartier Certificate of Authenticity dated 2003, key and unsigned presentation box. Estimate at CHF 600k to 1.2M.  Sold for CHF 1,219,200 at Phillips Auctions May 10 2026 Geneva